Predict/Calculate A 9 3-kg box slides across the floor of an elevator with a coefficient of kinetic friction equal to 0.38. (a) What is the force of kinetic friction acting on the box when the elevator is at rest? (b) If the elevator moves upward with constant acceleration, is the force of kinetic friction acting on the box greater than less than or equal to the value found in part (a)? Explain. (c) Determine the force of kinetic friction acting on the sliding box when the elevator moves upward with a constant acceleration of 1.4 m/s 2 .
Predict/Calculate A 9 3-kg box slides across the floor of an elevator with a coefficient of kinetic friction equal to 0.38. (a) What is the force of kinetic friction acting on the box when the elevator is at rest? (b) If the elevator moves upward with constant acceleration, is the force of kinetic friction acting on the box greater than less than or equal to the value found in part (a)? Explain. (c) Determine the force of kinetic friction acting on the sliding box when the elevator moves upward with a constant acceleration of 1.4 m/s 2 .
Predict/Calculate A 9 3-kg box slides across the floor of an elevator with a coefficient of kinetic friction equal to 0.38. (a) What is the force of kinetic friction acting on the box when the elevator is at rest? (b) If the elevator moves upward with constant acceleration, is the force of kinetic friction acting on the box greater than less than or equal to the value found in part (a)? Explain. (c) Determine the force of kinetic friction acting on the sliding box when the elevator moves upward with a constant acceleration of 1.4 m/s2.
Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.
2.62 Collision. The engineer of a passenger train traveling at
25.0 m/s sights a freight train whose caboose is 200 m ahead on the
same track (Fig. P2.62). The freight train is traveling at 15.0 m/s in the
same direction as the passenger train. The engineer of the passenger
train immediately applies the brakes, causing a constant acceleration
of 0.100 m/s² in a direction opposite to the train's velocity, while the
freight train continues with constant speed. Take x = 0 at the location
of the front of the passenger train when the engineer applies the brakes.
(a) Will the cows nearby witness a collision? (b) If so, where will it take
place? (c) On a single graph, sketch the positions of the front of the pas-
senger train and the back of the freight train.
Can I get help with how to calculate total displacement? The answer is 78.3x-4.8y
2.70 Egg Drop. You are on the Figure P2.70
roof of the physics building, 46.0 m
above the ground (Fig. P2.70). Your
physics professor, who is 1.80 m tall,
is walking alongside the building at
a constant speed of 1.20 m/s. If you
wish to drop an egg on your profes-
sor's head, where should the profes-
sor be when you release the egg?
Assume that the egg is in free fall.
2.71 CALC The acceleration
of a particle is given by ax(t) =
-2.00 m/s² +(3.00 m/s³)t. (a)
Find the initial velocity Vox such that
v = 1.20 m/s
1.80 m
46.0 m
Chapter 6 Solutions
Physics, Books a la Carte Plus Mastering Physics with Pearson eText -- Access Card Package (5th Edition)
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.