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A(n) 0.5 kg softball is pitched at a speed of 14 m/s. The batter hits it back directly at the pitcher at a speed of 22 m/s. The bat acts on the ball for 0.019 s. What is the magnitude of the averag
The length of the vibrating portion is 31.3cm and has a mass of 0.341g. Under what tension must the string be placed?
The distance between the two events is 2400 m in reference frame. What is the time interval between the events in reference frame.
A 11.0 g bullet is fired horizontally into a 110 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 140 N/m. The bullet b
If a rocket leaves from earth and flies to planet X in 7 years by its onboard clock, how fast was it going ? Assume that the planet is at rest with respect to the Earth.
The mass of a star is 1.75·1031 kg and its angular velocity is 1.30E-7 rad/s. Find its new angular velocity if the diameter suddenly shrinks to 0.47 times its present size. Assume a uniform
When the spring is stretched to a total length of .60 m, it supports traveling waves moving at 4.5 m/s how fast will waves travel on this spring if it is stretched to .90 m.
A 65.5 kg ice skater moving to the right with a velocity of 2.67 m/s throws a 0.19 kg snowball to the right with a velocity of 21.7 m/s relative to the ground. What is the velocity of the ice skater
Suppose the roller coaster in the figure (h1 = 40 m, h2 = 15 m, h3 = 20) passes point A with a speed of 2.40 m/s. If the average force of friction is equal to one sixth of its weight, with what spee
A 25-cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. Where is the image and is it real or virtual?
It makes a glancing collision with a second puck of radius 6.00 cm and mass 140.0 g (initially at rest) such that their rims just touch. Because their rims are coated with instant-acting glue, the p
Determine the thickness of the layer of oil. The density of wood is 796 kg/m3, of the liquid 1296 kg/m3, and of the oil 606 kg/m3.
During a workout, the football players ran up the stadium stairs in 73 s. The stairs are 120 m long and inclined at an angle of 30°. If a typical player has a mass of 101 kg, estimate the averag
A 300 kg piano slides 4.1 m down a 30 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
A 578-N physics student stands on a bathroom scale in an 879-kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 434 N. Find the magnitud
A bullet is fired vertically 550 m from the ground the muzzle velocity is 250 m/s. What height it will reach?How long will it take to reach the maximum height? How long is it airbourne?
A 7.0×10-2-kg toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 1.30 m/s in a horizontal circle of radius 0.47 m, Find
The particles (which can't be distinguished) are observed moving at angles 73.3° and 16.7°, both angles being measured with respect to the original direction of motion. What are the final sp
When two tuning forks of 131 Hz and 145 Hz, respectively, are sounded simultaneously, how many beats per second are heard? Answer in units of beats/s
How many grams of 23592U are consumed in one year, in order to supply the energy needs of a household that uses 32.0 kWh of energy per day, on the average?
Children in a tree house lift a small dog in a basket 4.60 m up to their house. If it takes 211 J of work to do this, what is the combined mass of the dog and basket?
At this instant, what is the current in the inductor? c) Find the maximum energy stored in the inductor. At this instant, what is the current in the circuit?
A single slit of width .030 mm is used to project a diffraction pattern of 500 nm light on a screen at a distance of 2.00 m from the slit. What is the width of the central maximum?
As the problem begins, the wave is moving to the right at v = 1 m/s. What is the shape of the wave on the string after 5 s?
A baseball is hit with a speed of 29.0 at an angle of 48.0. It lands on the flat roof of a 12.0 -tall nearby building.If the ball was hit when it was 1.2 above the ground, what horizontal distance d