Q1. A 20 N crate began at rest slides down a rough 5.0 m long ramp, inclined at 25 with the horizontal. 20 J of energy is lost to the friction. Determine the speed of crate at the bottom of the incline?
a) 0.98 m/s
b) 1.9 m/s
c) 3.2 m/s
d) 4.7 m/s
e) 5.6 m/s
Q2. A 0.12 kg ball is moving with 6 m/s when it is hit by a bat, causing it to reverse the direction and encompass a speed of 14 m/s. Determine the change in the magnitude of momentum of the ball?
a) 0.39 kgm/s
b) 0.42 kgm/s
c) 1.3 kgm/s
d) 2.4 kgm/s
e) 3.2 kgm/s
Q3. Lonnie pitches a baseball of mass 0.20 kg. The ball arrives at the home plate with a speed of 40 m/s and is batted straight back to the Lonnie with a return speed of 60 m/s. If the bat is in contact with ball for 0.050 s, then find out the impulse experienced by the ball?
a) 360 Ns
b) 20 Ns
c) 400 Ns
d) 9.0 Ns
e) 35 Ns
Q4. A grindstone spinning at the rate of 8.3 rev/s consists of what estimated angular speed?
a) 3.2 rad/s
b) 26 rad/s
c) 52 rad/s
d) 81 rad/s
e) 97 rad/s
Q5. A 0.30 m radius automobile tire rotates how many rad after beginning from the rest and accelerating at a constant 2.0 rad/s2 over 5.0 s interval?
a) 12.5 rad
b) 25 rad
c) 2.0 rad
d) 0.50 rad
e) 0.25 rad