Answer:
(v2² - v1²)/(2x) = (7.5² - 5.0²)/(2*50) = 0.3125 m/s²
The acceleration of the boat is 0.16 m/s².
We have a boat.
We have determine the boat's acceleration.
What is Acceleration ?The rate of change of velocity with time is called Acceleration.
a = dx/dt
According to the question -
Initial velocity (u) = 5m/s
Final velocity (v) = 7.5m/s
Distance (d) = 50 m.
Now -
v²- u² = 2aS
(v + u)(v - u) = 2aS
12.5 x 2.5 = 200 a
a = 0.16 m/s².
Therefore, the acceleration of the boat is 0.16 m/s².
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Why is copper a pure substance? A. Because it is an element B. Because it is a compound C. Because it is a homogenous mixture
At the same amplitude or volume, which sound would have the highest frequency?
violin
tuba
ambulance siren
dog whistle
BRAINEST IF CORRECT, please hurry, URGENT
A student practicing for a track meet ran 250 m in 30 seconds. What was her average speed?
Answer:
8.33 meters/sec.
Explanation:
distance = 250 meters
time = 30 sec.
velocity = distance / time
= 250 meters
30 sec.
= 8.33 meters/sec.
A student's average speed will be "8.33 m/sec". To understand the calculation, check below.
Speed, Time and DistanceAccording to the question,
Distance, d = 250 m
Time, t = 30 seconds
We know the relation,
→ Distance = Speed × Time
or,
→ Speed = [tex]\frac{Distance}{Time}[/tex]
v = [tex]\frac{d}{t}[/tex]
By substituting the values, we get
= [tex]\frac{250}{30}[/tex]
= 8.33 m/sec
Thus the above answer is correct.
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A block of mass 4 kilograms is initially moving at 5m/s on a horizontal surface. There is friction between the block and the surface which causes the block to come to a complete stop. The coefficient of kinetic friction between the block and the surface is 0.5. If the system is defined as the block only, which of the following statements would be correct?
A. There is a negative change in internal energy of the system as the block comes to a stop
B. There is a positive change in internal energy of the system as the block comes to a stop
C. There is a negative work done to the system as the block comes to a stop
D. There is a positive work done to the system as the block comes to a stop
Answer:
A
Explanation:
if block is only system then it's internal energy decreses . if horizontal surface is also part of system then energy remain conserve.
work is negative when F and d have opposite direction
Which of the following is NOT a type of sediment?
a. Minerals
b. Sand
c. Soil
d. Silt
Answer:
It's soil.
Explanation:
WILL GIVE BRAINLIEST!!!
An accident occurred on the tollway. A driver accidentally passed through a faulty barricade on a bridge (quite, unfortunately) and landed in a pile of hay (quite, fortunately). Measurements at the accident scene revealed that the driver plunged a vertical distance of 8.26 meters. The car carried a horizontal distance of 42.1 meters from the location where it left the bridge. How fast, in miles per hour, was the car going when it went through the barricade. Assume that the contact with the barricade did not slow the car down. (1.00 m/s = 2.24 mi/hr) (Hint: You need time to solve this problem.)
Answer:
72.53 mi/hr
Explanation:
From the question given above, the following data were obtained:
Vertical distance i.e Height (h) = 8.26 m
Horizontal distance (s) = 42.1 m
Horizontal velocity (u) =?
Next, we shall determine the time taken for the car to get to the ground.
This can be obtained as follow:
Height (h) = 8.26 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
h = ½gt²
8.26 = ½ × 9.8 × t²
8.26 = 4.9 × t²
Divide both side by 4.9
t² = 8.26 / 4.9
Take the square root of both side by
t = √(8.26 / 4.9)
t = 1.3 s
Next, we shall determine the horizontal velocity of the car. This can be obtained as follow:
Horizontal distance (s) = 42.1 m
Time (t) = 1.3 s
Horizontal velocity (u) =?
s = ut
42.1 = u × 1.3
Divide both side by 1.3
u = 42.1 / 1.3
u = 32.38 m/s
Finally, we shall convert 32.38 m/s to miles per hour (mi/hr). This can be obtained as follow:
1 m/s = 2.24 mi/hr
Therefore,
32.38 m/s = 32.38 m/s × 2.24 mi/hr / 1 m/s
32.38 m/s = 72.53 mi/hr
Thus, the car was moving at a speed of
72.53 mi/hr.
QUESTION ONE
1
An aeroplane of mass 2.5 - 10 kg lands with a speed of 62 m/s, on a horizontal runway at time
10. The aeroplane decelerates uniformly as it travels along the runway in a straight line until it
reaches a speed of 6.0 m/s at t = 355,
(a) Calculate:
(1) the deceleration of the aeroplane in the 35 s after it lands
Answer:
The deceleration of the aeroplane is 1.6 m/s²
Explanation:
The speed of the aero plane after landing = 62 m/s
The time of deceleration of the aero plane = 35 seconds
The speed of the aero plane after deceleration for 35 s = 6.0 m/s
Therefore, we have the kinematic equation of motion of the aero plane, v = u - a·t
Where;
v = The final velocity = 6 m/s
a = The deceleration of the aero plane
t = The time of deceleration = 35 s
u = The initial velocity = 62 m/s
Substituting the values gives;
6 = 62 - a × 35
35·a = 62 - 6 = 56
a = 56/35 = 1.6
The deceleration of the aero plane = a = 1.6 m/s²
How much kinetic energy does a 55 kg object have that is traveling 20m/s?
Answer:
11000 J
Explanation:
Apply the formula: K = 1/2.m.v²
K = 1/2.55.20²
K = 1/2.55.400
K = 55.200
K = 11000 Joules
times will the kinetic one
Kinetic energy
. By how many
body increase if its speed is tripled? show by
gy of a
calculation,
Answer:
The new kinetic energy is 9 times of the initial kinetic energy.
Explanation:
The kinetic energy of an object is given by the formula as follows :
[tex]E=\dfrac{1}{2}mv^2[/tex]
Where
m is mass and v is speed of the body
If the speed of the body is tripled. Let v' is the new speed, v' = 3v. The new kinetic energy is E' and it is given by :
[tex]E'=\dfrac{1}{2}mv'^2\\\\\text{Put v' = 3v}\\\\E'=\dfrac{1}{2}m\times (3v)^2\\\\=\dfrac{1}{2}m\times 9v^2\\\\=9\times (\dfrac{1}{2}mv^2)\\\\E'=9\times E[/tex]
Hence, the new kinetic energy is 9 times of the initial kinetic energy.
A person with a mass of 72 kg is riding a bicycle is accelerating at a rate of 5m/s on a horizontal surface. What is the weight force the person exerts on the bicycle seat
Answer:
w = 706.32 [N]
Explanation:
The force due to gravitational acceleration can be calculated by means of the product of mass by gravitational acceleration.
w = m*g
where:
w = weight [N] (units of Newtons)
m = mass = 72 [kg]
g = gravity acceleration = 9.81 [m/s²]
Then we have:
[tex]w = 72*9.81\\w = 706.32 [N][/tex]
3. The impulse necessary to change the momentum of an object by 5
kgm/s is:
Answer:
Impulse, J = 5 kg-m/s
Explanation:
Accoding to impulse-momentum theorem, the change in momentum of an object is equal to the impulse applied to it. In this problem, the change in momentum of an object is 5 kg-m/s.
We need to find the impulse necessary to change the momentum. So, impulse will be equal to 5 kg-m/s.
Describe seven physical properties that help distin-
guish one mineral from another.
Answer:
Color, Streak, luster, cleavage and fracture, hardness, crystal shape, and density.
Explanation:
User Location: Inside ViewportViewport Location: Fresh Viewport in downtown San Fransisco, CaliforniaQuery: [Burger King]Result: Burger King (located just outside the Fresh Viewport)What steps should you take to rate this result?answer choice:Check the pin locationCheck the official website for the addressCheck if there are closer results that we are not returningAll of the above
Answer:
All of the above
Explanation:
The steps that should be taken for rating the results is as follows
1. Pin location checking
2. Offical website checking for the address purpose
3. The checking should be done for the closer results in the case of non-returning
Therefore all of the above steps are required and taken for rating the results
Hence, the same is to be considered
What is the pressure exerted by a block of wood of mass 10 kg with an area of 0.1 m2
?
i. 1000 N ii. 100 Pa iii. 1000 Pa iv. 100 N
Answer:
0.01
Explanation:
first to answer will be marked brainliest :p
Answer:
HI!!!
Explanation:
Answer:
what is your questions
Find the acceleration due to gravity on the surface of Mars. The
mass of Mars is 6.42x102kg and its radius is 3370km.
Please Help Me Its Really needed urgently
Answer:
The acceleration due to gravity on the surface of Mars is approximately 3.773 m/s²
Explanation:
The given parameters for Mars with guidance from online search are;
The mass, m = 6.42 × 10²³ kg
The given radius of Mars, r = 3,370 km = 3,370,000 m
The gravitational constant, G = 6.674 × 10⁻¹¹ N·m²/kg²
Therefore, we have, the acceleration due to gravity on the surface of Mars, [tex]g_{Mars}[/tex] given as follows;
[tex]g_{Mars}[/tex] = G × m/r² = 6.674 × 10⁻¹¹ × 6.42 × 10²³/(3,370,000)² ≈ 3.773
The acceleration due to gravity on the surface of Mars, [tex]g_{Mars}[/tex] ≈ 3.773 m/s².
A car of weight 2000 Newtons (N) moves horizontally with an acceleration of 3.3 meters/second square. What is the Force acting on the car?
Explanation:
Mass of the car = 2000N / 10 = 200kg.
Fnet = ma. Assuming there is only the horizontal force acting on the car, then
F = (200kg)(3.3m/s²) = 660N.
Answer:
Mass of the car = 2000N / 10 = 200kg.
[tex]F_{net} = ma[/tex]
If there is only the horizontal force acting on the car, then
[tex]F = (200kg)(3.3m/s^{2}) = 660N.[/tex]
Explanation:
Hope this helped!
please guys help me i will help u too
Answer:
calculate the cars acceleration usingv=u+at
Explanation:
m/s. After 5 s the car reaches the bottome of the hill. Its speed at the bottom of the ... accelerating left a rownie. 10. A cart slows down while moving away from the ... does it need to accelerate to a velocity of 20 m/s
Given
u = 20 m/sv = 30 m/st = 10 sFind
a = ?ExplanationUsing Formula
★ v = u + at.
Keep all values.
➡ 30 = 20 + a × 10
➡10a = 30 - 20
➡a = 10/10
➡a = 1 m/s².
Answer all please correctly. 50 points!
Answer:
Explanatin
its not 50 points it's 25!
Answer:
it is still 25 points
Explanation:
What is resistive force?
A bullet of mass 20 gm is shot from a gun with velocity 200ms^-1. The bullet stops after penetrating 6cm of a wood.
Determine resistive force of the bullet.
Answer:
In physics, resistive force is a force, or the vector sum of numerous forces, whose direction is opposite to the motion of a body, and may refer to: Friction, during sliding and/or rolling.
A 7.80-g bullet moving at 575 m/s penetrates a tree trunk to a depth of 5.50 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.
Explanation:
A cable in which there is 12500 N of tension force supports an elevator. What is the magnitude
and direction of the acceleration of the elevator if its total mass is 1175 kg?
Answer:
a = 10.638m/s^2 in a vertical direction, up 90 degrees from the x axis
Explanation:
Givens:
F_t = 12500N
w = 1175kg
g = -9.81m/s^2
F = m(a)
F_w = m(g)
So taking the weight of the elevator and multiplying it with gravity we get:
F_w = 1175(-9.81)
F_w = -11526.75N
So since the weight of the elevator and the acceleration of gravity would result in 11526.75N of force down the cable would have the opposite force pulling up 11526.75N but it doesn't it has more force then that so the elevator is producing enough force to defeat gravity and move upwards. So now we take our total force and subtract the force of the weight on the cable.
12500N-11526N = 973.25N
So the elevator after defeating gravity is still producing 973.25N of force upwards. So now we take the equation for force and rearrange it:
F = m(a)
a = F/m
a = 0.828m/s^2
But this is in addition to countering the gravity so add 9.81m/s^2 to this and you get
a = 10.638m/s^2 in a vertical direction, up 90 degrees from the x axis
can someone help with thsi? i will give brainliest
Answer:
40 meters. look for the dot above the 20 on the x-axis and follow it over to the left.
Explanation:
Explain how the same object can weigh more by the ocean than it does at the
top of a mountain?
The gravitational force at a mountain will be lesser as compared to that at sea level therefore weight of an object at a mountain is less than its weight at sea level.
What is the difference between mass and weight?Mass and weight are generally used interchangeably but these two different quantities. A physical body can never have zero mass. Any massive body suffers force due to the gravitational field of other objects and this force is called weight.
The weight changes if the gravitational field strength changes, however, its mass remains constant. An object weighs differently on the Earth and Moon but its mass remains the same.
The mass is an intrinsic property that measures inertia. It quantifies the resistance a body provides during a change in the state of motion.
m = F/a
A body feels attraction due to gravity and the force exerted by a gravitational field on an object is called its weight.
W = mg where g is the gravitational acceleration.
As we move to the higher the gravitational pull decrease as compared to the sea level. The weight of an object is maximum at sea level. The weight of the same object will be less at a mountain than that at sea level.
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An object moving with constant acceleration near the surface of the earth
is influenced by...
A. a constant net force
B. zero net force
C. no forces
D. cannot be determined without more information
Which example best defines "wellness"?
A) A person who is free from disease.
B) A person who believes he or she can.
C) A person who reaches optimal health in all components.
D) A person who takes the good with the bad.
Answer:
c
Explanation:
Answer:
I believe its C
Explanation:
it sounds most reasonable.
Explain the difference between the four states of matter.
Answer:
Solids :A solid has a definite shape and volume because the molecules that make up the solid are packed closely together and move slowly. Solids are often crystalline; examples of crystalline solids include table salt, sugar, diamonds, and many other minerals. Solids are sometimes formed when liquids or gases are cooled; ice is an example of a cooled liquid which has become solid. Other examples of solids include wood, metal, and rock at room temperature. Liquids : A liquid has a definite volume but takes the shape of its container. Examples of liquids include water and oil. Gases may liquefy when they cool, as is the case with water vapor. This occurs as the molecules in the gas slow down and lose energy. Solids may liquefy when they heat up; molten lava is an example of solid rock which has liquefied as a result of intense heat. Gases : A gas has neither a definite volume nor a definite shape. Some gases can be seen and felt, while others are intangible for human beings. Examples of gases are air, oxygen, and helium. Earth's atmosphere is made up of gases including nitrogen, oxygen, and carbon dioxide. Plasma: Plasma has neither a definite volume nor a definite shape. Plasma often is seen in ionized gases, but it is distinct from a gas because it possesses unique properties. Free electrical charges (not bound to atoms or ions) cause the plasma to be electrically conductive. The plasma may be formed by heating and ionizing a gas. Examples of plasma include stars, lightning, fluorescent lights, and neon signs.
Explanation:
How to solve part (b)?
Answer:
1.11m
Explanation:
From the diagram we are given the following forces;
F1 = 24.3N
F3 = 30N
Since the sum of upward forces is equal to that of downward force, then;
F2 = F1 + F3
F2 = 24.3N + 30N
F2 = 54.3N
Required
Distance between B and C
First we need to get Length of AC
Take moment about A
Anticlockwise moment = F3 cos20 * AC
Anticlockwise moment = 30ACcos 20
Clockwise moment = 1.2 * F2
Clockwise moment = 1.2(54.3) = 65.16Nm
Applying the principle of moment;
Sum of ACW moment = Sum of CW moments
30ACcos 20 = 65.16
AC = 65.16/30cos20
AC = 65.16/28.19
AC = 2.31m
Get the distance BC
AC = AB + BC
BC = AC-AB
BC = 2.31 - 1.2
BC = 1.11m
Hence the separation between B and C is 1.11m
Note that the force F1 got in (a) was the value used in the calculation.
To what does the amplitude of a sound refer to?
Answer:
The number of molecules displaced by a vibration creates the amplitude of a sound. The strength or level of sound pressure. The number of molecules in the sound wave in b is greater than the number in the sound wave in a, therefore the amplitude of the sound wave in b is greater.
Explanation:
Which career may be a good fit for you if you enjoy planning meals and learning about proper nutrition?
A.
fitness instructor
B.
physical therapist
C.
medical researcher
D.
registered dietician
Answer:
D. Registered dietitian
Answer:
D
Explanation:
