Explanation:
Everyday Examples of Sliding Friction
Rubbing both hands together to create heat.
A sled sliding across snow or ice.
Skis sliding against snow.
A person sliding down a slide is an example of sliding friction.
A coaster sliding against a table.
A washing machine pushed along a floor.
An iron being pushed across material.
GIVING BRAINLY, FOLLOW AND STARS, HELP!
When a solid object absorbs infrared rays, what happens to the particles
in that object?
Answer:
All objects emit and absorb infrared radiation. The hotter an object is the more energy it radiates per second. Infrared radiation can travel through a vacuum. When infrared radiation hits an object some of the energy is absorbed, making the objects temperature increase, and some is reflected.
Explanation:
A person is running west in Moscow at 2.1 km/hr relative to the ground and from his
perspective, another person is jogging east at 4.5 km/hr. What is the velocity of the jogger
relative to the ground?
Answer:
4.96 km/hr
Explanation:
Given that,
A person is running west in Moscow at 2.1 km/hr relative to the ground
Another person is jogging east at 4.5 km/hr.
We need to find the velocity of the jogger relative to the ground. Using the concept of relative speed, let V is the required velocity. So,
[tex]V=\sqrt{2.1^2+4.5^2} \\\\=4.96\ km/hr[/tex]
So, the velocity of the jogger relative to the ground is 4.96 km/hr.
The image below models how air can move by convection at the Earth's equator.
convection current of air at Earth's equator
Which statement best describes this process?
A.
Convection currents on Earth are driven by the gravitational pull of the Sun.
B.
Differences in gravity at various latitudes causes the rising and sinking of air.
C.
Convection currents are driven by the orbit of Earth around the Sun.
D.
Differences in air density cause the rising and sinking of air.
Reset Submit
Answer: C
Explanation: i hoped that helped!
Answer:Differences in air density cause the rising and sinking of air.
Explanation: HOPE THIS HELPS the other one is wrong
Which type of graph would be best for showing the percentage of people in a
family with different jobs?
A. Bar graph
B. Circle graph
C. Scatterplot
D. Line graph
What was Galileo’s contribution to the study of motion?
A.
He developed the three laws of motion.
B.
He was the first to systematically study force and motion.
C.
He was the first to discover gravity.
D.
He improved on Newton’s laws.
An object is traveling with a constant velocity of 5 m/s. How far will it have gone after 7 s?
Answer:
35 miles
Explanation:
5 times 7
What would a velocity of a rock dropped from a cliff be after falling for 6 seconds?
A. 58.8m/s
B. 1.6m/s
C. 12m/s
D. 30m/s
Answer:
A. 58.8m/s
Explanation:
The acceleration due to gravity is 9.8 m/s², so the velocity after 6 seconds is ...
v = at
v = (9.8 m/s²)(6 s) = 58.8 m/s
A light ray enters a piece of transparent plastic with a thickness of 50 m and a refractive index of 1.2. What is the time taken by the ray to propagate through the plastic if the velocity of light in air is 3 x 10^8 ms^-1?
The options for the answer are 2.5 x 10^-8 s / 2.0 x 10^-8 s / 1.5 x 10^-7 s / 2.0 x 10^-7 s
Answer:
t= 2*10⁻⁷ seconds
Explanation:
Refractive index is given by the formula;
η= c/v where c= 3.0 * 10⁸ m/s speed of light and v is speed of light in plastic
substitute the values in the formula as;
1.2 = 3.0 * 10⁸/ v
3.0 * 10⁸ /1.2
v= 2.5 *10⁸ m/s
t= distance / speed
t= 50/2.5*10⁸
t= 2e⁻⁷ seconds
t= 2*10⁻⁷ seconds
Olivia went to the beach with her friends on a sunny day when the temperatures were especially high. She got a sunburn and became dehydrated because she didn’t drink enough water. What steps should Olivia have taken to reduce the risk of overexposure to the sun? Choose the three that apply.
A. wear sunglasses and sunscreen
B. wear sandals
C. swim more
D. carry along a towel
E. wear protective clothing
F. avoid direct sunlight during the hottest part of the day
Answer:
A. wear sunglasses and sunscreen
E. wear protective clothing
F. avoid direct sunlight during the hottest part of the day
Explanation:
Olivia should have worn sunglasses to protect her eyes from the sun as well as sunscreen to protect her skin and prevent sunburn.
She should have also worn protective clothing to prevent sunlight hitting her skin directly.
Finally Olivia should have avoided direct sunlight during the hottest times in the day to reduce her exposure to the sun and reduce damage to her skin.
8. Volcanoes that are mostly made up of pyroclastic material are called?
a.
Cinder Cone
b. Composite
c. Shield
d.
None of these
Answer:
I think it is Cinder Cone volcano.
PLEASE HELP
Does the double-slit experiment provide evidence for the wave model or the
particle model of light? Why?
A. The particle model, because particles collide with the slits,
removing electrons
OB. The wave model, because the slits cause light to slow down as
waves would
O C. The particle model, because particles pass through the slits,
creating a pattern
D. The wave model, because the slits cause light to bend as a wave
would
Answer:
D
Explanation:
The double-slit experiment provides evidence for the wave model because the slits cause light to bend as a wave would.
What is wave nature of light?Huygens proposed in 1678 that each location where a bright disturbance intersects becomes a source of the spherical wave itself. What shape the new wave will take is determined by the sum of the secondary waves, which are a result of the disturbance. The "Huygens' Principle" is the name given to wave theory of light.
In the double-slit experiment, light waves passes through two slits separated by a small distance and then light waves propagates as light waves from two coherent source and then they bend and interfere. Hence, option (D) is correct.
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You are at a circus and you see a stunt man climb up 29.4 meters into a cannon. He gets fired horizontally out of the cannon with a speed of 57.1 m/s.
How long was stunt man in the air for? Round your answer with TWO decimal places. *Correct rounding rules apply
Answer:2.45 s rounded
Explanation:
29.4m=1/2(-9.8)t^2
29.4/-4.9=6
√6= 2.44> rounded> 2.45 s
A car has an i total speed of 7m/s.it's speed increases by 21m/s. It took 2.1 seconds for the speed to change. What is the acceleration
Answer:
For this question we should apply
a = v^2 - u^2 by t
a = 21 - 7 by 2.1
a = 14 by 2.1
a = 6.66 m/s^2
.:. The acceleration is 6.66 m/s^2
please help!! i will give 100 points!!
Answer:
no one else is answering, also its only 5 points -_-
Explanation:
Please help!!
Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.
What experimental evidence led to the development of this atomic model from the one before it?
A. A few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil.
B. Experiments with water vapor showed that elements combined in specific proportions.
C. Equations were used to identify regions around the nucleus where electrons would likely be.
D. Cathode rays were bent in the same way whenever a magnet was brought near them.
Answer: C. Equations were used to identify regions around the nucleus where electrons would likely be.
Which statement best explains why the atomic theory developed efficiently?
A- scientists ignored all previous knowledge about atoms.
B- scientists had used creativity and The scientific method in their investigations.
C- scientists had used the philosophical viewpoint as a method of investigation.
D- scientists rarely repeated experiments to make sure the results were correct.
Answer:
I think its B but if not then its D
Explanation:
Answer:
b
Explanation:
Points for hasna31 →_→ you lucky nugget
Answer:
ok thx BTW I changed my username lol
You throw a baseball from the roof of a house to a friend on the ground. The ball has an
initial velocity of 12.0 m/s in the horizontal direction. After 1.00 s, how fast is the ball
moving in (a) the x direction and (b) the y direction. A) the velocity in the x-direction
doesn't change. Therefore, after 1.00 seconds we have
Please help!!
Answer:
a) 12.0 m/s
b) 9.81 m/s in the downward direction
Explanation:
The initial velocity of the ball in the horizontal direction = 12.0 m/s
a) The velocity of the baseball in the x-direction remains the same therefore, we have;
The velocity of the ball in the x-direction (horizontal direction) after 1 second = 12.0 m/s because there is no net acceleration in the horizontal direction
b) The velocity in the y-direction is given by the following kinematic equation;
v = u - g × t
Where;
v = The final vertical velocity of the ball after t seconds
u = The initial vertical velocity = 0
g = The acceleration due to gravity = 9.81 m/s²
t = The time taken in motion = 1.00 s
Substituting the values gives;
v = 0 - 9.81 m/s² × 1.00 s = -9.81 m/s
v = -9.81 m/s
The vertical velocity of the ball after 1.00 second = -9.81 m/s which is 9.81 m/s downwards.
(a) The final velocity of the ball after 1,0 second in y - direction is -9.8 m/s.
(b) The final velocity of the ball after 1,0 second in x - direction is 12 m/s.
The given parameters:
initial horizontal velocity of the ball, u = 12 m/stime of motion, t = 1 sThe final velocity of the ball after 1,0 second in y - direction is calculated as follows;
[tex]v_f_y = v_0_y - gt\\\\v_f_y = 0 - (9.8\times 1)\\\\v_f_y = -9.8 \ m/s[/tex]
The final velocity of the ball after 1,0 second in x - direction is calculated as follows;
[tex]v_x_f = v_0_x \\\\v_x_f = 12 \ m/s[/tex]
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If a hockey puck were to slide on a perfectly frictionless surface, it will eventually slow down because of its inertia.
True or False
Answer: TRUE
Explanation: a hockey puck slides on a perfectly frictionless surface, it will eventually slow down because of its inertia. Inertia is the property that every material object has that causes objects to resist changes in its state of motion.
rest and motion are relatives terms justify the statement
Answer:
rest and motion are the relative terms because they depend on the observer's frame of reference. So if two different observers are not at rest with respect to each other, then they too get different results when they observe the motion or rest of a body
Explanation:
How does electromagnetic induction in a moving loop of wire cause an
electric generator to produce an electric current?
A. Mechanical energy flows out of the magnets and into the electric
charges in the loop of wire.
B. Charged particles flow within the wire because they are pushed by
the magnetic field of the magnets.
C. Charged particles flow when the loop of wire is attracted by the
magnetic field of the magnets.
O D. Electrons flow from the magnets into the loop of wire and
continue to flow within the wire.
Answer: Just took it!
Explanation:
Mechanical energy flows out of the magnets and into the electric charges in the loop of wire. Therefore, the correct option is option A among all the given options.
What is electric current?A current is the movement of particles (electrons) across wires and components. It is the charge flow rate. If an electric charge passes through a conductor, scientists say the conductor has an electric current. Electrons form a charge flow in circuits that use metallic conductors.
Electromagnetic induction in a moving loop of wire cause an electric generator to produce an electric current by mechanical energy flows out of the magnets and into the electric charges in the loop of wire cause.
Therefore, the correct option is option A among all the given options.
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A block of mass 4 kg rests on a frictionless horizontal surface, what horizontal force is required to accelerate the block at 5 m/s^2 ?
Answer:
20N
Explanation:
Given parameters:
Mass of the block = 4kg
Acceleration = 5m/s²
Unknown:
Horizontal force needed to accelerate the block = ?
Solution:
According to Newton's second law of motion;
Force = mass x acceleration
Now insert the parameters and solve;
Horizontal force = 4 x 5 = 20N
I WILL GIVE BRAINLIEST!!!!
The image above shows two opposite forces acting on a rope, what can we say is true about the affect of the forces on the rope?
Pilots depend on the precision of ------------------------- systems to guide them when they have limited visibility. PLEASE ANSWER QUICKLY. WILL MARK BRAINLIEST IF CORECT.
Answer:
Pilots depend on the precision of INSTRUMENT LANDING SYSTEMS to guide them when they have limited visibility.
Explanation:
A pilot is a professionally trained individual that has the ability to control an aircraft following directions from a flight control.
Instrument landing system is a guidance system that makes available an instrument based procedures for guiding the pilot of an aircraft to approach and land safely. This system guides the pilot during unfavorable conditions such as low visibility through the use of radio signals.
There are two types of guidance provided by this system:
-> Lateral guidance subsystem and
-> Vertical guidance subsystem.
Lateral guidance subsystem prevents the aircraft approaching a runway to shift laterally from the path recommended.
Vertical guidance subsystem prevents the aircraft approaching a runway to shift laterally from the recommended path.
Answer:
instrument landing systems
Explanation:
....
[The illustration shows a lamp giving off light. What form of energy does the lamp use to produce light?
Answer:
I think it's electrical energy
Which best describes Earth's magnetic pole?
A.) Aligned with the geographic South Pole
B.) Circling around the geographic North Pole
C.) Defined by Earth's rotation
D.) Wandering slowly with no pattern
Answer:
Wandering Slowly with no pattern
Explanation:
I apologize to those who got it wrong from the first person.
The Earth's magnetic pole is wandering slowly with no pattern. Then the correct option is D.
What is the magnetic pole?Magnetic poles are the points near the extremities of the axis of rotation of the Earth or another celestial body where a magnetic needle dips vertically.
At either end of a magnet, the magnetic pole is where the applied magnetic field is strongest. An imaginary basic particle known as a magnetical monopole may be referred to as a magnet's pole. A unique type of magnet is the magnetism poles of celestial bodies.
The north magnetism pole of the earth Today is located where the north arrow is on a path leading downhill.
The magnetic pole is located far away from the geographic pole.
Earth's magnetic pole is defined as wandering slowly with no pattern.
Thus, the correct option is D.
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A cycler rides 27.0 km in 13 minutes, then 33.0 km in 17 minutes. What is the jogger's average speed in km per minute?
Answer:
Average speed = 2.01km/min
Explanation:
Given the following data
Distance A = 27
Time A = 13 mins
Distance B = 33km
Time B = 17mims
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex]
For part A
Speed = 27/13
Speed = 2.08km/min
For part B
Speed = 33/17
Speed = 1.94km/min
Average speed = (A + B)/2
Average speed = (2.08 + 1.94)/2
Average speed = 4.02/2
Average speed = 2.01km/min
A physical change can be distinguished from a chemical change because during a physical change- A. the properties of the substance may change, but no new substances are produced B. the properties of the substance change for only a short time but will return to their original state. C. an entirely new substance with new properties forms as a result of the change D. a new substance is produced, but the new substance has properties identical to the original substance.
Answer:
a
Explanation:
yw
Answer:
Its B and C on edge
Explanation:
A roller coaster car has a mass of 400kg and a speed of 15m/s What will be the P.E of this roller coaster car at its highest point ,where KE =0 at that point
Answer:
3000J
Explanation:
Given parameters:
mass = 400kg
speed = 15m/s
Unknown:
P.E at the highest point of the roller coaster = ?
Solution:
Due to the law of conservation of energy, the potential energy at the highest point can be solved using the formula of the kinetic energy
Potential energy = [tex]\frac{1}{2}[/tex] mv²
m is the mass
v is the velocity
Potential energy = [tex]\frac{1}{2}[/tex] x 400 x 15 = 3000J
Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional questions. Free Weights and Machines What are some things to consider when deciding to use free weights or machine weights?
Machine weights are safer when used correctly, but free weights can be dropped and cause injury. These are safety considerations to keep in mind whether using free weights or machine weights. But because they aren't big, complicated machinery, free weights are less expensive.
What are free weights or machine weights?Resistance machines and free weights are very different from one another in terms of how they work and the results they can create.
Machines are set in place and can only move in a few directions, whereas free weights can be moved in whatever direction the user selects. This is the main distinction between machines and free weights. Free weights require you to utilize more stabilizing muscles to control them, whereas resistance machines help you by stabilizing you while you move.
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