19. If a block is pulled toward the east, the frictional force exerted on the box should be toward the: * O North O South O East O West 20. A 250 kg ball and a 5 kg ball, made of the same material, are dropped at the same time. When they hit the ground and the 250 kg ball makes a much louder noise. Why does this happen? O a. The 250 kg ball falls faster, so it hits the ground at a faster speed. b. The 250 kg ball hits the ground with more force than the 5 kg ball. O c. The 250 kg ball has less air resistance than the 5 kg ball. d. The 250 kg ball falls faster, so it hits the ground with more force.

19. If a block is pulled toward the east, the frictional force exerted on the box should be toward the: * O North O South O East O West 20. A 250 kg ball and a 5 kg ball, made of the same material, are dropped at the same time. When they hit the ground and the 250 kg ball makes a much louder noise. Why does this happen? O a. The 250 kg ball falls faster, so it hits the ground at a faster speed. b. The 250 kg ball hits the ground with more force than the 5 kg ball. O c. The 250 kg ball has less air resistance than the 5 kg ball. d. The 250 kg ball falls faster, so it hits the ground with more force.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter11: Collisions

Section: Chapter Questions

Problem 11PQ

See similar textbooks

Similar questions

When an 80.0-kg man stands on a pogo stick, the spring is compressed 0.120 m. (a) What is the force constant of the spring? (b) Will the spring be compressed more when he hops down the road?
B3
7. An Undamped spring mass system is used at a high efficient mixer. The Srping in the system as a spring consant of 30 pounds per foot. A container which weighs 10 pounds is placed on the spring. Thes sping mass system has a safety shut off when the mass moves beyond 1 ft. We want to acchieve a maximum amount of mixing with a external force which does not exceed 1 pound. a. What external driving force should we apply? b. At what time will the system trigger the automatic shut off? (Hint: zoom in on a plot)
A freight car of mass 1800 kg is timed at 4.2 m/s just after it runs into a spring-loaded bumper at the end of the track. The bumper consists of an 800 kg mass that the car runs into, and a pair of large springs. The car travels 2.4 m before coming to rest.a. Using an appropriate conservation law, find the speed of the freight car before it struck the bumper. b. Find the time taken for the car to be brought to rest.
13. A block and spring are arranged on a horizontal, frictionless surface. The spring constant is 500 N/m and the mass of the block is 4.5 kg. The block is pushed against the spring so that the spring is compressed by 0.35 m. The block is released. What is the velocity of the block as it is released from the spring. wwwwwww
6. Consider a spring-mass system given by mu" + yu' + ku=0. a. Suppose y2>4mk and the initial conditions are u(0) = 5, u'(0) = a HUGE negative number. How many time(s) will the mass pass through the equilibrium position? JUST GIVE ME A NUMBER AS YOUR ANSWER. Infinity is considered a number. b. Same as above with y² = 4mk and u(0) = 2, u'(0) = a HUGE positive number. Infinity is considered a number. C. Suppose <4mk and the initial conditions are u(0) = -.0001, u'(0) = 0. How many time(s) will the mass pass through the equilibrium position? JUST GIVE ME A NUMBER AS YOUR ANSWER. Infinity is considered a number. d If y = 2 what is the limit of u(t) as too? JUST GIVE ME A NUMBER AS YOUR ANSWER. Infinity is considered a number.
A spring with k= 360 N/m is compressed x = 11cm by a 1.85 kg block on a horizontal table with coefficient of friction of 0.38. This means there is friction everywhere on the table! A. What is the speed of the block when it is released? B. Determine the distance the block travels before it comes to rest.
1. A block of mass m is pushed against (but not attached to) a spring with stiffness k so that the spring is compressed a distance Ar. When released, the block slides across the frictionless surface of a shelf a height h above the floor, the then falls to the floor. a. What is the speed of the block at the moment it leaves the shelf? V2 = b. What is the speed of the block at the moment just before it hits the ground? Vr =
A super ball of mass 0.1 kg is dropped from a height of 3.0 m above the floor. It bounces off the table and rises to a height of 2.6 m. This is an elastic col- lision similar to the carts with springs in your lab. a. Calculate the velocity of the ball the instant before it reached ground level, V₁. Hint: You can use conservation of mechanical energy and the height it is dropped from to get this velocity. +x-DIRECTION Now use conservation of energy to calculate the velocity the ball must have after the collision at the instant it leaves the ground to reach a height of 2.6 m. Figure 8-21 C. These velocities are the initial and final velocities for the collision with the ground. Use them to calculate the change in momentum of the ball. Don't forget the directions are not the same so one will be +₂ the other --. b. 2.0 m
#71
A1
4. Suppose a block of mass m slides over a surface with kinetic friction coef- ficient towards a spring with spring constant k. The block reaches the spring with spring with speed vo. (a) How far is the spring compressed at maximum compression? Give your answer in terms of m, k, lk, and vo. (b) What is an expression for the maximum value that v。 could be in order for the spring to remain maximally compressed, no matter what material the block and surface are? Give your answer in terms of m, k, pk. Hint: the coefficient of static friction is always greater than the coefficient of kinetic friction.