Answer: C
Explanation: because it is made out of metal.
Answer:
C- iron nail.
Explanation:
iron nails are attracted to magnets and that's made of magnetic material.
a strong spring is stretched 10 cm by a suspended block. if the block's weight is doubled, the spring will stretch to group of answer choices 5 cm. 10 cm. 15 cm. 20 cm.
Using the concepts of spring, we got that the spring will stretch to d) 20 cm if the block's weight on the strong spring is doubled.
When a block is attached on the spring ,a tension will generate on the spring which actually helps the block to remain suspended with the string.
Gravity tries to attract the block towards the surface and tension tries to remain the block with the spring. When the weight is doubled, to hold the same block on the spring, more tension will generate. Due to that spring will expand further more in downward direction.
So when weight is doubled, then spring will be expanded by another 10cm means total length of expansion of string will be 20cm.
Hence, for a strong spring is stretched 10 cm by a suspended block. if the block's weight is doubled, the spring will stretch to d)20cm
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The half-life of iodine-131 is 8.07 days. If 0.25 g are left after 40.35 days, how many gramswere in the original sample?
Given data
*The half-life of iodine-131 is t = 8.07 days
*The amount of quantity left is N = 0.25 g
*The number of days is T = 40.35 days
The expression for the radioactivity decay is given as
[tex]N=N_0(\frac{1}{2})^{\frac{T}{t}}[/tex]Substitute the values in the above expression as
[tex]\begin{gathered} \text{0}.25=N_0(\frac{1}{2})^{\frac{40.35}{8.07}} \\ N_0=8\text{ g} \end{gathered}[/tex]Answer:
See below
Explanation:
40.35 days / (8.07 day per half life) = 5 half lives
.25 = x ( 1/2)^5
.25 / ( 1/2)^5 = x = 8 gm originally
a hemisphere of ice with radius r rests so with its flat surface fixed to the ground. a block starts at rest at the top of the hemisphere and is given a nudge so that it slides (without friction) down the slope. how high above the ground will the block be when it looses contact with the ice (hint: what has to be zero when the block loses contact with the ice)?
The height of the block from ground is when block loses contact with the ice. This can be solved by using energy conservation and centrifugal force.
Initially the block is placed at a height of r because the height of the hemisphere would be the radius.
So total energy would be = mgr
when it is going to leave the surface, there will be some kinetic and static energy,
so total energy = 1/2 x m x v^2 + m x g x rcosФ
from conservation of energy theorem, we can write
Total energy before = total energy after
mgr = 1/2 x m x v^2 + m x g x rcosФ
2 gr = v^2 + 2 x g x rcosФ
Again, when the object is loosing the contact, that time the centrifugal force will be equal to the vertical force,
(m x v^2)/r = mgcosФ
=> v^2 = grcosФ
putting the values in the above equation
2gr = grcosФ + 2grcosФ
cosФ = 2/3
Also, we can find that when object is losing the contact, the height of the object would be = rcosФ
= r x 2/3
= 2r/3
Hence the height of the object when it is losing the contact is 2r/3.
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On which object will Earth's gravity act with the greatest magnitude? *
An apple
A cereal bowl
A watermelon
A TV remote
Answer: The watermelon
Explanation: The watermelon has a larger mass than the rest of the three.
Howard leans back against a wall with 50 N of force. According to Newton’s Third Law of Motion, what force is being applied and in what direction?
A.) The wall applies a force of 100 N in the opposite direction.
B.) The wall applies a force of 50 N in the same direction.
C.) The wall applies a force of 50 N in the opposite direction.
D.) The wall applies a force of 100 N in the same direction.
The wall applies a force of 50 N in the opposite direction. Option C
What is the Newton third law?According to the Newton third law, action and reaction are equal and opposite. We know that when a body exerts a given magnitude of force on a surface, the surface would also a force of equal magnitude back on the surface but the force would now be acting in the opposite direction.
This force that is exerted by the recipient of the force is what we call the reaction force. We are told here that; Howard leans back against a wall with 50 N of force. We are now going to look at the magnitude and the direction of the forces.
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Answer:
The wall applies a force of 50 N in the opposite direction.
Explanation:
6. Suppose that two chrome steel balls attract each other with a gravitational
force of 16 units. If the mass of both objects was doubled, and if the distance
between the objects was doubled, then what would be the new force of attraction
between the two objects?
4 units
8 units
16 units
32 units
64 units
Answer:
Explanation:
Given:
m₁
m₂
R₁
F₁ = 16 units
m₁' = 2·m₁
m₂' = 2·m₂
R₂ = 2·R₁
_________
F₂ - ?
The force of gravity:
F₁ = G·m₁·m₂ / (R₁)²
F₂ = G·m₁'·m₂' / (R₂)² = G·(2·m₁)·(2·m₂) / (2·R₁)² =
= 4·m₁·m₂ / (4·R₁²) = m₁·m₂ / (R₁)² = F₁
F₂ = F₁ = 16 units
A current of 11.37 A passes through a wire. How many electrons pass through the wire in 18.19 seconds ?
Explanation
An Ampere is in the SI base unit of electric current equal to one coulomb per second.
[tex]\text{ 1 Ampere=}\frac{1\text{ C}}{s}[/tex]and remember that the charge of an electron is
[tex]Q_e=-1.6*10^{-19\text{ }}C[/tex]Step 1
a) let
[tex]\begin{gathered} I=11.37\text{ Amperes} \\ I=11.37\text{ A}*(\frac{\frac{1C}{s}}{A})=11.37\frac{C}{s} \\ also \\ time\text{ =}18.9\text{ s} \end{gathered}[/tex]so
[tex]\begin{gathered} I=\frac{Q}{time} \\ replace \\ 11.37A=\frac{Q}{18.19} \\ multiply\text{ both sides by 18.19} \\ 11.37A*18.19=\frac{Q}{18.19}*18.19 \\ 206.8206\text{ C}=Q \end{gathered}[/tex]b) now , to find the number o f electrons , divide the total a}charge by the charge of an electron
[tex]Number\text{ of electrons=}\frac{206.8206C}{\lvert{-1.6*10^{-19\text{ }}C}\rvert}=1.29*10^{21}\text{ electrons}[/tex]therefore, the answer is
[tex]\begin{equation*} =1.29*10^{21}\text{ electrons} \end{equation*}[/tex]I hope this helps you
Describe where microwaves are found on the ems compared to the other six forms of radiation.
On the EMS microwaves fall between radio waves and infrared radiations.
Electromagnetic radiation, which travels through space and conveys electromagnetic radiant energy, makes up electromagnetic radiation.
EMS consists of
radio waves, microwaves, infrared radiations, visible light, ultraviolet radiations, X-rays, gamma rays.These waves are all components of the electromagnetic spectrum. Electromagnetic waves are synchronized oscillations of the electric and magnetic fields that make up electromagnetic radiation in a classic way. Due to the periodic alteration of the electric or magnetic field, electromagnetic radiation or waves are produced. Different wavelengths of the electromagnetic spectrum are created depending on the manner in which this periodic change takes place and the power generated. Electromagnetic waves move at the speed of light, in a vacuum.
An image is attached for further clarification.
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HELP ME
PLS I will give brainliest
Answer:
Option 2
Explanation:
Since they want to know kinetic energy being increased, it cannot be Options 1 or 3. So now we're left with 2 and 4. 4 seems to be decreasing, so we can eliminate that. So, our answer is Option 2.
what helps create metamorphic and sedimentary rock
Answer:
!
Explanation:
Sedimentary rocks originate when particles settle out of water/air, or by precipitation of minerals from water. They accumulate in layers. The most important processes that lead to the creation of sedimentary rocks are erosion, weathering, dissolution, precipitation, and lithification.
Metamorphic rocks result when other rocks are changed by heat, pressure, or reactive fluids, such as hot, mineral-laden water, and sometimes a combination of all these factors. These conditions are found deep within the Earth or where tectonic plates meet.
A sedimentary rock is a rock formed through weathered and compacted sediments. These kinds of rocks undergo five major stages: erosion, deposition, weathering, compaction, and cementation. Through the breaking down and combining of scattered sediments, sedimentary rocks are formed.
What is a metamorphic rock?A metamorphic rock is typically thought of as a rock that undergoes intense heat and pressure in the mantle of Earth. This kind of rock can be formed from any kind of process, as long as it goes through a phase of extreme exposures to heat. Metamorphic rocks are common underground. These rocks eventually rise to Earth's surface, and they cool and crystallize to become igneous rocks.
There are 16 ounces in a pound. Calculate the equivalent of a one ounce force in newtons.
The equivalent of a one ounce force in Newtons = 0.278N
What is an ounce in physics?Ounce is a unit of mass used in the imperial and US measurement systems. Shorthand: oz. A slice of bread weighs about the same as one ounce. The actual weight is 28.349523125 grammes. In some systems of measurement, such as English engineering units and British gravitational units, an ounce-force is a unit of force.
The ounce-force is equivalent to the force produced by a mass of one ounce in a typical gravitational field. Meanwhile, the SI-derived unit of force is the newton (N). It is equal to the force necessary to accelerate a mass of one kilograms at a rate of one meter per second squared, according to Newton's second law of motion. Consequently, 1 N = 1 kg/m/s2.
Given:
16 ounces in a pound
So, 1 ounce-force = 1/16 lbf ≈ 0.27801 N.
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the beam is balanced use the principle of moments to calculate the weight, W, of the monkey in newtons.
the objects weight on the left is 350N and the distance from the pivot is 20m. the second object on the right weight is x and distance from the pivot is 1.5m
Answer:
below
Explanation:
350 * 20 has to equal x * 1.5
350 * 20 = 1.5 x
x = 4666.7 N
34. What temperature in the graph below indicates that heat is being used to "break links" binding liquid molecules--that is, the region where the substance is vaporizing?Select one:a. 120°b. 80°c. 60°d. 20°
We know that in a change of state heat is used to break the links between the molecules or atoms of the substance but the temperature remains the same; in the graph shown we notice that we have two portions where the temperature remains constant 20° and 120°. Since vaporizing happens at greater temperature that solid to liquid change of state we conclude that the region where this happens is 120°; therefore, the answer is A.
a mouse runs a distance of 2.0 meters in 16 seconds. calculate the speed of the mouse
S=d/t
S=2/16
S=0.125m/s
1000 kg car is driving forward with a speed of 25 m/s. it comes to rest in a distance of 100m what is its change in kinetic energy during this process
If a 1000 kg car is driving forward with a speed of 25 m/s and it comes to rest in a distance of 100m, the change in kinetic energy during this process is - 312.5 KJ
KE = 1 / 2 m v²
KE = Kinetic energy
m = Mass
v = Velocity
m = 1000 kg
Initially,
v = 25 m / s
KEi = 1 / 2 * 1000 * 25²
KEi = 312500 J
Finally,
v = 0, since the object comes to rest.
KEf = 1 / 2 * 1000 * 0
KEf = 0
ΔKE = KEf - KEi
ΔKE = Change in kinetic energy
ΔKE = 0 - 312500
ΔKE = - 312500
ΔKE = - 312.5 KJ
Therefore, the change in kinetic energy during this process is - 312.5 KJ
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A ball is fired at 5 m/s to the right and bounces off a second ball, initially at rest, and comes back to the left at 1m/s. What is the velocity of the second ball? Assume both balls have a mass of 3.86kg and make to the right positive.
ANSWER:
6 m/s
STEP-BY-STEP EXPLANATION:
Given:
Mass of balls (m) = 3.86 kg
Initial speed of ball 1 (u1) = 5 m/s
Final speed of ball 1 (v1) = - 1 m/s
Initial speed of ball 2 (u2) = 0 m/s
We make the balance for the moment and we are left with the following:
[tex]\begin{gathered} m_1\cdot u_1+m_2\cdot u_2=m_1\cdot v_1+m_2\cdot v_2 \\ \\ \text{ We repalcing:} \\ \\ 3.86\cdot5+3.86\cdot0=3.86\cdot-1+3.86\cdot v_2 \\ \\ 19.3=-3.86+3.86v_2 \\ \\ 3.86v_2=19.3+3.86 \\ \\ v_2=\frac{23.16}{3.86} \\ \\ v_2=6\text{ m/s} \end{gathered}[/tex]Therefore, the speed of the second ball is equal to 6 m/s
Energy can be transferred between objects or systems; momentum cannot be transferred and is only gained or lost from an object or system.
In a collision when two or more objects collide, the momentum will be transferred between the objects involved in the collision. But the total momentum of a system will always be conserved. Thus the system will never lose or gain momentum.
Thus the given statement is false.
What happens to light waves from a star as the star moves toward Earth?A. They appear to shift toward red.B. They appear to shift toward blue.C. They appear to become mechanical waves.D. They appear to stop.
When a star moves toward or away from the earth, the light will be in a slightly different place in the spectrum from where a start would be at rest.
Due to the doppler effect, if a star moves toward the earth, the star's spectral lines will make a shift toward the blue end of the spectrum.
Therefore, the light waves from a star as the star moves toward the earth will appear to shift toward blue.
ANSWER:
B. They appear to shift toward blue.
If a river is flowing north at 2 m/s and you swim straight across east at 1.5 m/s, how far up shore will you be from your starting point once you reach the other side? The river is 9 m wide
The distance is 12m
The direction of movement of the body or object is defined by velocity. Speed is fundamentally a scalar quantity. Velocity is, in essence, a vector quantity. It is the rate at which distance changes. It is the displacement rate of change.
Given a river is flowing north at 2 m/s and you swim straight across east at 1.5 m/s,
We have to determine how far up shore will be from your starting point once you reach the other side when the river is 9 m wide
First, solve for the time it takes you to reach the other side. Let's let north be the y-direction and the direction across the river be the x-direction.
∆X =Vxt
9m = 1.5m/s x t
T = 9/1.5
T= 6sconds
Now use the time you are in the water to find
∆Y= Vyt
∆Y= 2m/s x 6s
= 12m
Therefore the distance is 12m
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Light of frequency 3.62 x 10^15 Hz strikes a surface of copper (W0=4.70 eV). How much kinetic energy does the liberated electron have in eV?
From the equation of photoelectric effect, the kinetic energy is 10.2 eV.
What is the kinetic energy?According to the Einstein photoelectric equation, we know that the kinetic energy is the difference between the energy of the incident photon and the work function of the metal.
KE = E - Wo
KE = kinetic energy
E = energy of the photon
Wo = work function
Thus;
E = hf
h = Plank's constant
f = frequency
E = 6.6 * 10^-34 * 3.62 x 10^15
= 2.39 * 10^-18 J or 14.9 eV
Thus we have;
KE = 14.9 eV - 4.70 eV
KE = 10.2 eV
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Answer:
10.2 eV
Explanation:
there's no need for an explanation
A baseball player throws a ball horizontally off a cliff that is 19.8 m tall. The ball lands 29.3 m away from the base of the cliff. What is the horizontal velocity of the ball?
Answer:
v = 58.893 m/s
Explanation:
I assume we are assuming -10 for gravity
Vertically:
Thrown vertically so initial vertical velocity is 0
Δy = vi*t + 0.5*a*t^2
-19.8 = 0*t + 0.5*-9.8*t^2
t^2 = 4.0408
t = 2.01s
Horizontally:
v = d*t
v = 29.3m * 2.01s
v = 58.893 m/s
An object with a mass of 188 kg accelerates 6.09 m/s² when an unknown force is applied to it. What is the magnitude
of the force?
The magnitude of the force is 1144.92 N.
How do you define force?
Physicists define force as:
Push or pull which when applied to an object having mass causes it to change its velocity in response to the push or pull.
It has a magnitude and a direction. The direction of the force is referred to as the force's direction, and the application of force is the place at which the force is applied.Using a spring balance, the Force can be quantified. Newton is the SI-defined unit of force (N).The vector product of mass (m) and acceleration represents the amount of force (a).
Mathematically speaking, the force equation or formula can be written as follows:
F = ma
where m equals mass
a represents acceleration.
It is articulated either in Newton (N) or Kgm/s2.
As per Newtons second law of motion,
F=m×a
Given in the question,
Mass, m=188 kg
Acceleration, a=6.09 m/s2
Therefore,
F=188 x 6.09
F=1144.92 N
Hence, the magnitude of the force is 1144.92 N
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What is the percentage efficiency of a 70W bulb that produces 210J of light energy over a minute?
Answer:
5%
Explanation:
here
power = 70w
output = 210 J
time = 1 mins = 60 secs
for total input we get
input energy = P*t
= 70*60 = 42000J
for the efficiency we know that
%efficiency = (total output / total input ) * 100%
= (210/42000) * 100%
= 5%
Answer:
Explanation:
Given:
P = 70 W - Lamp power
A = 210 J - Lamp energy
t₀ = 1 min = 60 s - Time
_________
ε - The percentage efficiency
t = A / P = 210 / 70 = 3 s
ε = t / t₀ = 3 / 60 = 0.05 or ε = 0,05·100% = 5%
A roller coaster car is cresting a hill at 10 m/s . if the hill has a 30 m radius, what force will the 70 kg rider feel from the seat of the coaster? (the seat force is the normal force)
Answer:
A 53.5-kg rider on a roller coaster car is moving 10.3 m/s at the top of a loop which has a radius of curvature of 7.29 m.
Explanation:
A wheel of radius 30.0 cm is rotating at a rate of 2.30 revolutions every 0.0810 s. The linear speed of a point on the wheel’s rim = 178 radWhat is the linear speed of a point on the wheel’s rim?What is the wheel’s frequency of rotation?
Given data
*The given radius of the wheel is r = 30.0 cm = 0.30 m
*The given angle of the wheel rotates in 1.00 s is
[tex]\theta=178.0\text{ rad}[/tex]*The angular velocity of the wheel is
[tex]\omega=178.0\text{ rad/s}[/tex]The formula for the linear speed of a point on the wheel's rim is given as
[tex]v=r\omega[/tex]Substitute the known values in the above expression as
[tex]\begin{gathered} v=(0.30)(178.0) \\ =53.4\text{ m/s} \end{gathered}[/tex]Hence, the linear speed of a point on the wheel's rim is v = 53.4 m/s
The formula for the wheel's frequency of rotation is given as
[tex]\begin{gathered} \omega=2\pi f \\ f=\frac{\omega}{2\pi} \end{gathered}[/tex]Substitute the known values in the above expression as
[tex]\begin{gathered} f=\frac{178.0}{2\times3.14} \\ =28.34\text{ Hz} \end{gathered}[/tex]Hence, the wheel's frequency of rotation is f = 28.34 Hz
For 3.5 seconds, an ostrich ran west at 2.6 meters per second. In that time, how far did it
run?
Write your answer to the tenths place.
The distance covered by an ostrich in 3.5 seconds by running at the speed of 2.6 meters per second is 9.1 m.
What is distance?
Distance is the measurement of how far the objects under consideration are. It can be measured in terms of meters, centimeters, kilometers etc. Distance is a scalar quantity unlike displacement which is a vector quantity.
The distance covered by an ostrich can be calculated as, d = s * t
where d is distance, s is speed and t is the time taken.
d = 2.6 ms^-1 * 3.5 s = 9.1 m.
Therefore, the ostrich ran for 3.5 seconds to cover 9.1 m distance at the speed of 2.6 meters per second.
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A solar-powered car has a kinetic energy of 110250 J. Its mass is 180 kg. Work out how fast the car is travelling Enter a number m/s
Answer: Velocity = v = 35 m/s
Explanation:
Kinetic energy of an object is defined as the energy possess by an object due to its motion. Kinetic energy K.E of an object is equal to the half of the mass of that object multiplied by square of the object's velocity.
Mathematically,
v = 35 m/s
Two students in bumper cars want to prove conservation of momentum. They collide their bumper cars. The first bumper car has a mass of 120 kg and was moving with a velocity of 4 m/s before the collision and with a velocity of −2 m/s after the collision. The second bumper car has a mass of 90 kg and was moving at a velocity of −5 m/s before the collision. To prove conservation of momentum, what must the velocity of the second bumper car be after the collision?
A. 1.0 m/s
B. 2.7 m/s
C. 3.0 m/s
D. 2.3 m/s
The velocity of the second bumper car will be 3 m/s after the collision.
Given parameters:
Mass of the first bumper car; m = 120 kg.
Mass of the second bumper car; M = 90 kg.
Before collision velocity of first bumper car; u = 4 m/s.
Before collision velocity of second bumper car; U = -5 m/s.
After collision velocity of first bumper car; v = -2 m/s.
After collision velocity of second bumper ; V= ?
From principle of conservation of momentum,
Total momentum before collision = Total momentum after collision
⇒ 120 × 4 + 90 × (-5) = 120 × (-2) + 90 × V
⇒ 90 × v = 270
⇒ v = 3 m/s.
The velocity of the second bumper car must be 3 m/s after the collision.
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Hello, I needed help with a few assignment questions. Thank you. It's about Newton's second law of motion.
We will have the following:
2) We can determine that the ratio is constant due to the fact that the acceleration of the gravity on Earth remains constant on the planet. And the mass of the planet is constant.
3) What causes the objects accelerate is the mass of the body that supports them and the mass of the very object. In clasical mechanics the acceleration is due to the influence that a body imparts on another. In relativistic mechanics the acceleration is due to the warping of the space that makes the bodies towards the one with a bigger sphere of influence.
It can also be interpreted as the relationship of the force that is imparted on a body by another and the mass of the smaller object.
Which of the following is NOT a means to determine the efficiency of a machine? A) useful work output/work input B) useful power output/power input C) effort x distance moved by effort/load distance moved by load D) load x distance moved by load/effort x distance moved by effort
In general terms, efficiency is output/input.
For a lever, the effort is the input and load is the output.
Thus, option C is not a means to determine efficiency as effort is the input and load is the output.
