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Two ice skaters, Daniel (mass 70.0 kg) and Rebecca (mass 45.0kg), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 13.0m/s before she collides with him. After the collision, Rebecca has a velocity of magnitude 7.00m/s at an angle of 53.1 from her initial direction. Both skaters move on the frictionless and horizontal surface of the rink.
The flywheel of an engine has moment of inertia 2.50 kg about its rotational axis. What constant torque is needed to bring it up to an angular speed of 400 rev/min in 8.00 s, starting from rest?
in a harmonic pendulum, the lengths are increasing monotonically; the lengths are measured so that in a defined set of oscillations (i.e. 20 cycles in 20 seconds), what are a set of lengths that would work
A basketball player grabbing a rebound jumps 70 cm vertically. How much total time (ascent and descent) does the player spend (a) in the top 11.9 cm of this jump and (b) in the bottom 11.9 cm.
a small charged pith ball is suspended 2 cm above a second charged pitch ball resting on an insulated surface. what charge must be on the upper ball to lift the lower ball
A playground merry-go-round spins with negligible friction. A child moves from the center out to the rim of the merry-go-round platform. In this merry-go-round and child system, which of these quantities change:
A pendulum is made by tying a 550g ball to a 52.0cm -longstring. To what angle does the pendulum swing on the other side
In order to view the craters of the Moon, you construct a refracting telescope from a lens with focal length 92.3 cm as its objective and a 14.3-cm focal length lens as its eyepiece
point p is at a potential of 540 kv and point s is at a potential of 250 kv. the space between these points is
A frictionless spring of spring constant 500 N/m has one end attached to a vertical wall and the other end to a block of mass 3.0 kg, What is the maximum Elastic Potential Energy
A 50 kg person climbing a rope slides down after reaching the top. find The frictional force acting upward on the person
A ball of mass 10.7 g with a speed of 27.1 m/s strikes a wall at an angle 24.0o and then rebounds with the same speed and angle. calculate the average force exerted by the ball on the wall
A tuning fork with frequency 540 Hz is dropped from a building of height 125 m with a musician. The musician can hear the fork sounding as it falls. What frequency does the musician hear right after three seconds?
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