Ways to Go
The velocity of a motorcyclist who starts from rest and maintains a constant acceleration of 3 m/s2 for 10 s.
p.119#3
30 m/s
The 1000-kg rocket's upward acceleration while expelling gas downward with a force of 20,000 N.
20 m/s2
The magnitude of the velocity to hit the ground of a rock thrown horizontally from the top of a cliff 98 m high, with a horizontal speed of 27 m/s.
43.8 m/s
Rate of change of velocity over time.
Acceleration
The distance a sprinter travels in 4.0 s if her acceleration is 2.5 m/s2. Assume she starts from rest.
p.119#2
20 m
The y-component of a 95.3 N force that is exerted at 57.1o to the horizontal.
p.149#6
80.0 N
The angle above horizontal of the initial velocity vector when on a level ground, a football is thrown up at a certain angle. The ball is in the air for 2.0 s and strikes the ground 30.0 m from the thrower.
33.2o
A tendency to do nothing or to remain unchanged.
Inertia
The driver's forward acceleration when he enters a new 110-km/h speed zone on the highway. The driver begins to accelerate immediately and reaches 110 km/h after driving 500 m. The original speed was 80 km/h.
p.87#3
0.44 m/s2
0.57
The horizontal distance between a 1.60 m tall girl and the spot when the football is again at the height above the ground from which the girl threw it at an angle of 41.0o from the horizontal and at an initial speed of 9.40 m/s.
p.175#1
8.90 m
The area under v-t graphs.
Displacement
The time it takes for a flower pot falling off a balcony 85 m above the street to hit the ground.
p.87#4
4.2 s
Jeeves is tired of his 41.2-kg son sliding down the banister, so he decided to apply an extremely sticky paste to the top of the banister. The paste increases the coefficient of static friction to 0.72. Find the magnitude of the static friction force on the boy if the banister is at an angle of 52.4o from the horizontal.
p.149#10
1.8 x 102 N
The time a diver takes when he takes off with a speed of 8.0 m/s from 3.0 m high diving board at 30o angle above the horizontal.
1.3 s
The contact force between two surfaces.
Normal force
The stopping distance when a car travelling at 91.0 km/h approaches the turnoff for a restaurant 30.0 m ahead. If the driver slams on the brakes with an acceleration of -6.40 m/s2.
p.87#6
50.0 m
The stopping distance required when Sukey is riding her bicycle on a path when she comes around a corner and sees that a fallen tree is blocking the way 42 m ahead. The coefficient of friction between her bike's tires and the gravel path is 0.36. Sukey and her bike together have a mass of 95 kg.She is traveling at 25.0 km.
p.149#8
6.8 m
The velocity a pebble hits a wall 12 m away when it is fired at an angle of 30o to the horizontal from a slingshot with a velocity of 30 m/s.
28.0 m/s
A state where the net force applied to a system is zero.
Equilibrium