A sprinter accelerates at 3.08 m/s² for a certain number of seconds during a 100.0 meter race. She runs the rest of the race at top speed and finishes the race in 10.59 s. What is her top speed?

A 890 g wooden block is initially at rest on a rough horizontal surface when a 15.8 g bullet is fired horizontally into (but does not go through) it. After the impact, the block-bullet combination slides 6.50 m before coming to rest. If the coefficient of kinetic friction between block and surface is 0.750, determine the speed of the bullet immediately before impact.
(No Response) m/s

Ball 1, with a mass of 140 g and traveling at 13 m/s , collides head on with ball 2, which has a mass of 320 g and is initially at rest.

What is the final velocity of the ball 1 if the collision is perfectly elastic?

Express your answer in meters per second.

What is the final velocity of the ball 2 if the collision is perfectly elastic?

What is the final velocity of the ball 1 if the collision is perfectly inelastic?

What is the final velocity of the ball 2 if the collision is perfectly inelastic?

A rocket is launched at an angle of 53.0° above the horizontal with an initial speed of 98 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 31.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile.

(a) Find the maximum altitude reached by the rocket.

(b) Find its total time of flight.

(c) Find its horizontal range.

For college physics. Please write in paragraph form, typed. Thanks!

Respond to the following:

In your own words, explain potential energy, kinetic energy, conservation of energy and examples in daily life.

In your own words, explain the definition of work in Physics.

In your own words, explain Hooke's Law and elastic potential energy.

a) Explain and give a numerical example of time dilation.

b) Explain and give a numerical example of length contraction.

A 2.9 kg block with a speed of 3.6 m/s collides with a 5.8 kg block that has a speed of 2.4 m/s in the same direction. After the collision, the 5.8 kg block is observed to be traveling in the original direction with a speed of 3.0 m/s. (a) What is the velocity of the 2.9 kg block immediately after the collision? (b) By how much does the total kinetic energy of the system of two blocks change because of the collision? (c) Suppose, instead, that the 5.8 kg block ends up with a speed of 4.8 m/s. What then is the change in the total kinetic energy?

• Describe in detail two modern applications of electromagnets. Do these electromagnets draw a large amount of current or a little? How do you know? What supplies that current?
• Why do you think electromagnets are used in these different ways?
• What is the advantage of using an electromagnet rather than a permanent magnet?

A ball thrown straight up into the air is found to be moving at 7.24 m/s after falling 2.27 m below its release point. Find the ball's initial speed. Thank you.

Determine the order in which the following objects released from the same height, initially at rest and rolling down an incline without slipping, will reach the bottom: A hollow sphere, a solid sphere, a hollow pipe, and a solid cylinder.

Please explain in simplest terms and give an example using units given.

A diver springs upward from a board that is 3.09 meters above the water. At the instant she contacts the water her speed is 8.52 m/s and her body makes an angle of 71.8° with respect to the horizontal surface of the water. Determine her initial velocity.

What are some spacecraft that aim to study how our Solar System was formed? What studies did each spacecraft conduct?

A 16 g ball is fired horizontally with speed v0 toward a 111 g ball hanging motionless from a 0.9-m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 111 g ball swings out to a maximum angle θmax=53°. What was v0?