Unless otherwise stated, ignore air resistance and assume the acceleration of gravity is g = 9.81 m/s2 vertically downward.
A car's initial velocity is along the -x direction. As it slows to a stop, its acceleration points in the -x direction.
(T) True (F) False
(a) T > mg (b) T = mg (c) T < mg
(a) d = 2v2/a (b) d = v2/a (c) d = v2/(2a) (d) d = v2/(4a) (e) d = v2/(8a)
An inclined plane makes an angle θ with respect to horizontal. A box of mass m sits at rest on the ramp, held in place by friction. The coefficient of static friction is μ.
What is the magnitude of f, the frictional force exerted by the ramp on the box?
(a) f = mgcosθ (b) f = mgsinθ (c) f = μmgcosθ
(a) f could increase or decrease depending on the values of m and μ. (b) f would increase (c) f would decrease
Compare T1, the time it takes for rock 1 to hit the ground, to T2, the time it takes for rock 2 to hit the ground.
(a) T1 > T2 (b) T1 = T2 (c) T1 < T2
Identify all the forces acting on M2 that have components along the x-axis.
(a) Static friction. (b) Static friction and M2a (c) Static friction and FPull
(a) -800.0 km/hr (b) -333.3 km/hr (c) +166.7 km/hr (d) +500.0 km/hr (e) +666.7 km/hr
Which of the following statements about x1, the position of the object at time t = t1, is true?
(a) x1 > 0 (b) x1 = 0 (c) x1 < 0
(a) The time t1 can be correctly calculated knowing only the acceleration and the position at time t = 0 (b) The time t1 can be correctly calculated knowing only the position and the velocity at time t = 0 (c) The time t1 can be correctly calculated knowing only the acceleration and the velocity at time t = 0
(a) M = 8.32 kg (b) M = 8.00 kg (c) M = 4.08 kg (d) M = 2.70 kg (e) M = 2.26 kg
A block of mass M1 sits atop a frictionless inclined plane (θ = 20°) and is connected by a massless string over an ideal pulley to another block of mass M2 as shown in the diagram below.
If M1 = 5 kg and M2 = 3kg, in which direction does M2 accelerate?
(a) M2 accelerates upwards (b) M2 does not accelerate (c) M2 accelerates downwards
(a) M2 = 5.0 kg (b) M2 = 1.7 kg (c) M2 = 4.7 kg
A quarterback throws a football toward a receiver who catches it t seconds later D meters away. Assume the ball is thrown and caught at the same height above the horizontal field and that you can ignore air resistance.
If t = 3 seconds and D = 60 m, what is the horizontal component v0x of the initial velocity of the ball?
(a) v0x = 10 m/s (b) v0x = 16 m/s (c) v0x = 20 m/s (d) v0x = 25 m/s (e) v0x = 29 m/s
(a) H = 5.0 m (b) H = 7.7 m (c) H = 11 m (d) H = 19 m (e) H = 44 m
A sign of mass M = 8 kg is suspended from the ceiling. The string on the right is connected to the sign such that it makes an angle of 45° with respect to the horizontal. The string on the left is connected to the sign such that it makes an angle 30° with respect to the horizontal.
How does TL, the tension in the left string, compare to TR, the tension in the right string?
(a) TL > TR (b) TL = TR (c) TL < TR
(a) TL = 78.5 N (b) TL = 57.5 N (c) TL = 43.1 N (d) TL= 39.2 N (e) TL = 35.9 N
What is the magnitude of the force fmonM, the frictional force the top block (m) exerts on the bottom block (M)?
(a) fmonM = 22.1 N (b) fmonM = 13.2 N (c) fmonM = 8.83 N (d) fmonM = 5.25 N (e) fmonM = 0 N
Three blocks of mass 2 kg, 3 kg, and 4 kg are arranged from left to right in order of increasing mass. The 2 kg block is then pushed with a force F = 60 N across a frictionless floor.
How does F2 on 3, the magnitude of the force the 2 kg block exerts on the 3 kg block, compare to F3 on 4, the magnitude of the force the 3 kg block exerts on the 4 kg block?
(a) F2 on 3 is smaller than F3 on 4 (b) They have the same magnitude (c) F2 on 3 is larger than F3 on 4
(a) 5.56 N (b) 6.67 N (c) 13.3 N (d) 38.9 N (e) 46.7 N
(a) 2vcan/g (b) 2vcanvboy/g (c) (vcan + vboy)/(2g)
(a) d/(va + vc) (b) d/(va - vc) (c) (vc + d) / va (d) d/va (e) d/vc
What is Gimli’s speed with respect to Aragorn while he’s running?
(a) 19.3 m/s (b) 43.6 m/s (c) 47.1 m/s (d) 53.5 m/s (e) 50.0 m/s