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Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can throw the ball is 86.0 mph. Bob starts the stopwatch as he throws the ball (with no way to measure the ball's initial trajectory), and watches carefully. The ball rises then and then falls, and after 0.710 seconds the ball is once again level with Bob. Bob can't see well enough to time when the ball hits the ground. Bob's friend then measures that the ball landed 321 ft from the base of the cliff. How high up is Bob, if the ball started from exactly 5 ft above the edge of the cliff?
An open railroad car of mass 2496 kg is coasting with an initial speed of 17 m/s on a frictionless, horizontal track. How much water (in kilograms) has accumulated in the car
in a marathon race chad is out in front running due north at a speed of 3.93 ms. john is 95 m behind him running due
A 7.80-g bullet moving at 560 m/s penetrates a tree trunk to a depth of 5.2 cm. Use work and energy considerations to find the average frictional force that stops the bullet
A segment of wire carries a current of 20 A along the y-axis from y = 2.0 to y =0 and then along the x axis from x = 0 to x =-4.0 m. What is the magnitude of the force on this segment of wire
Three sisters go skiing. Each has a mass of m = 50 kg. There are three different routes to the bottom. How fast is each sister going when she reaches the bottom
A tennis player standing 10.7 m from the net hits the ball at 2.50° above the horizontal. how fast was the ball moving when it left the racquet
q1. sphere pendulum has mass of 1.5 kg attached to a cord length of 11.5 m sphere is released from rest while cord
a cello string vibrates in its fundamental mode with a frequency of 267 vibrations per second. the vibrating segment is
If the frequency of oscillation of the wave emitted by an FM radio stationis 93.6 MHz, determine the wave's period of vibration
he density of free electrons in gold is 5.90x10^28 m^-3. The resistivity of gold is 2.44x10^-8 ohms.m at a temperature of 20 C, what is the drift velocity of the electrons in the wire
In screeching to a halt, the car leaves skid marks that are 65m long. How fast was the car going before thedriver applied the brakes
A square solenoid of length 6.82 cm has 212 turns and carries a current of 10.8 A. The sides of the solenoid measure 2.06 cm. find the magnetic flux through the cross-sectional area of the solenoid
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