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Q. A 42 kg pole vaulter running at 11 m/s vaults over the bar. Her speed while she is above the bar is 0.7 m/s. Avoid air resistance, as well as any energy absorbed by pole, and determine her altitude as she crosses the bar.
Dan is gliding on his skateboard at 4 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6 m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 7 kg. How fast is Dan going..
A father (m = 65 kg) and son (m = 38 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3.0 m/s after they have separated. How fast would the father be moving.
A tennis player places a 40 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.052 kg tennis ball horizontally with a velocity of 30.6 m/s toward the north. What will be the final velocity of the machine.
Throughout a hard sneeze, your eyes may shut for 0.41 s. If you are driving a car at 98 km/h during such a sneeze, how far does the car move during that time.
If the charge of the point charge in the figure were -2Q (instead of +Q), by what factor would the magnitude of the force on the point charge due to the dipole change.
Find out the sum of these four vector forces: 12N to the right at 35.0° above the horizontal, 31.0 N to the left at 51.5° above the horizontal, 7.45N to the left at 35.0° below the horizontal, and 24N to the right at 48.0° below the horizontal.
Calculate approximately E at a distance of 40 m (large relative to the plate size) by assuming that the plate is a point charge.
A 230-N child is in a swing that is attached to ropes 1.90m long. Find out the gravitational potential energy associated with child relative to her lowest position at the following times.
An antelope moving with constant acceleration covers the distance 77 m between two points in time 7.4 s. Its speed as it passes the second point is 15.5 m/s. What is its speed at first point.
A 3.20 kg block of wood sits on a table. A 2.50 g bullet, fired horizontally at a speed of 600 m/s, goes completely through the block, emerging at the speed of 180m/s. What is the speed of the block immediately after the bullet exits.
A force vector has a magnitude of 595 newtons and points at an angle 39o of below the positive x axis. What is (a) x scalar component and (b) y scalar component of the vector.
How fast must the car be travelling just as it leaves the cliff in order to clear the river and land safely on the opposite side.
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