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A 57 kg pole vaulter running at 1.1 m/s vaults over the bar. Her speed when she is above the bar is 1.0 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her al
A length d = 0.34 m of string has unwound off the disk. At this instant, how much rotational kinetic energy does the disk have relative to its center of mass?
A car is traveling at 70 mi/h on a horizontal highway. The acceleration of gravity is 9.8 m/s2 . If the coefficient of friction between road and tires on a rainy day is 0.1, what is the minimum dis
the energy is transmitted through a long-distance power line that has a resistance of 100. What percentage of the power delivered by the generator is dissipated as heat in the power line?
A dragster starts from rest and accelerates down the track. each tire has a radius of .32 m and rolls without slipping. at a distance of 384 m, the angular speed of the wheels is 288 rad/s. determin
Strapped securely in an advanced seat belt system, a 55 kg (121 lbs) dummy is found to move a distance of 0.75 m from the moment the car touches the wall to the time the car is stopped. Calculate th
A 2 kg book with no initial velocity, slides down an inclined plane with an angle of 20 degrees a total of 2 meters. The force of friction does 10 Joules of work, what is the final kinetic energy of
A 13 g bullet traveling 226 m/s penetrates a 2.0 kg block of wood and emerges cleanly at 162 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bulle
These blocks are allowed to move on a fixed block-wedge of angle θ = 30.0°. The coefficient of kinetic friction is 0.360 for both blocks. Draw free-body diagrams of both blocks and of the
A constant friction force tangential to its rim. The constant torque produced by this force is 73.0 N · m. Find the magnitude of the friction force.
A child slides down a slide with a 26° incline, and at the bottom her speed is precisely two-thirds what it would have been if the slide had been frictionless. Calculate the coefficient of kinet
Bowling ball traveling with constant spped hit the pins at the end of bowling lane 16.5 meters. The bowler hears the sound of ball hitting the pins 2.50 seconds after the ball is release from his ha
Tarzan (m = 81 kg) tries to cross a river by swinging from a 12.0 m long vine. His speed at the bottom of the swing, just as he clears the water, is 9.0 m/s. Tarzan doesn't know that the vine has a
A 89 kg water skier floating in a lake is pulled from rest to a speed of 10 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?
The resistance of the bulbs is 5.0 and 10.0 ohm. Sketch a neat diagram in each case and calculate the power consumed by each bulb if?
A horizontal pipe contains water at a pressure of 111 kPa flowing with a speed of 1.8 m/s. The pipe narrows to one-half its original diameter. What are the speed and the pressure of the water when
A worker drops a wrench from the top of a tower 89.0 m tall. With what velocity does the wrench strike the ground? (Assume the positive direction is upward.)
At some instant an electron located 0.15 m away from the wire is moving toward the top of the page with a speed of 5.2 × 104 m/s. Calculate the magnetic force on the electron.
A banked circular highway curve is designed for traffic moving at 81 km/h. The radius of the curve is 167 m. Traffic is moving along the highway at 42 km/h on a rainy day. What is the minimum coeffi
Winds pick up suddenly, increasing the wave's amplitude to 6 m. How does this change in amplitude affect the wave's frequency and the amount of energy it transports?
The focal length of a relaxed human eye is approximately 1.52 cm. When we focus our eyes on a close-up object, we can change the refractive power of the eye by about 13 diopters. Calculate the focal
Calculate how much charge must be placed on the surface of a sphere of radius 0.31 m for the electric potential just above the surface to be 100 V. Assume that the charge is uniformly distributed.
A car with a vertical radio antenna 75 cm long drives due west at 24 m/s. Find the induced emf between the ends of the antenna.
How much heat will flow through the glass in 1.00 h if there is a temperature difference of 2 C° between the inner and outer surfaces?
An electron is released from rest in a vacuum between two flat, parallel metal plates that are 11.0 cm apart and are maintained at a constant electric potential difference of 620 Volts. If the elect