Calculating the gravitational acceleration
A student drops a ball from a height of 15.6 m and measures the time it takes to hit the ground as 1.81 s. In calculating the gravitational acceleration g (in order to compare to its theoretical value 9.8 m/s^2, which of the following is correct?
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A rock of mass 44 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252 N. What is the magnitude of the acceleration of the rock?
It takes 140 J of work to move 2.7 C of charge from a positive plate to a negative plate. What voltage difference exists between the plates?
What is the magnitude of the maximum torque the crane can withstand if the maximum load the crane can handle is 738 N? What is the maximum load for this crane at an angle of 15° with the horizontal?
A 5.00-kg ball, moving to the right at a velocity of +2.00 m/s on a frictionless table, collides head-on with a stationary 7.50-kg ball. Find the final velocities of the balls if the collision is (a) elastic and (b) completely inelastic.
Discuss the importance of listening. In your opinion, has our fast paced society impacted our ability to listen? Explain and support your answer.
A submarine is 325 m horizontally out from the shore and 115 m beneath the surface of the water. A laser beam is sent from the submarine so that it strikes the shore. If the beam strikes the top of a building standing directly at the water's edge,
A tennis ball of mass 8.0×10-2 {rm kg} and speed 33 {rm m/s} strikes a wall at a 45 ^circ angle and rebounds with the same speed at 45 ^circ.
A U-shaped tube is partly filled water and partly filled liquid that does not mix water. Both sides of the tube are open to the atmosphere. What is the density of the liquid?
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