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Find the wavelength of the ultrasonic wave emitted by a bat it has a frequency of 4.0 * 10^4 Hz?
A 280 kg piano slides 4.5 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic f
Treat the coffee as though it were pure water and neglect energy exchanges with the environment. The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg. The density
A 95g arrow is fired from a bow whose string exerts an average force of 125 on the arrow over a distance of 83cm. What is the speed of the arrow as it leaves the bow?
You're on a rooftop and you throw one ball downward to the ground below and another upward. The second ball, after rising, falls and also strikes the ground below. If air resistance can be neglecte
The force exerted by the wind on the sails of a sailboat is 370 N north. The water exerts a force of 250 N east. If the boat (including its crew) has a mass of 250 kg, what are the magnitude and di
The loaded cab of an elevator has a mass of 2.7 x 103 kg and moves 198 m up the shaft in 27 s at constant speed. At what average rate does the force from the cable do work on the cab?
A charge of 4.0 x 10^-6 C is placed on a small conducting sphere that is located at the end of a thin insulating rod whose length is 0.20 m. The rod rotates with an angular speed of 150 radians/seco
A force of 5 pounds is required to hold a spring stretched 0.6 feet beyond its natural length. How much work is done in stretching the spring from its natural length to 1.1 feet beyond its natural l
An elevator has a mass of 1100 kg. Suppose it accelerates upward at .45 m/s2. What is the force acting on the elevators support cable?
One end of an iron poker is placed in a fire where the temperature is 500°C, and the other end is kept at a temperature of 26°C. The poker is 1.2 m long and has a radius of 5.0 10-3 m. Ignor
A solid sphere (I = 0.4MR2) of radius 0.06 m and mass 0.50 kg rolls without slipping 14m down a 30º inclined plane. At the bottom of the plane, the linear velocity of the center of mass of the
A(n) 74.6 g ball is dropped from a height of 69.6 cm above a spring of negligible mass. The ball compresses the spring to a maximum displacement of 4.91619 cm. The acceleration of gravity is 9.8 m/s
A 230 kg crate is pushed horizontally with a force of 740 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
If one of the masses of the Atwood's machine below is 2.8 kg, what should be the other mass so that the displacement of either mass during the first second following release is 0.34 m? Assume a mass
A skier is accelerating down a 30.0 ^circ hill at 1.80{rm{m/s^2}}. How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevati
A staging that weighs Wstaging supports a painter weighing 680 N. The reading on the left scale is 740 N and the reading on the right scale is 440 N. What is the weight of the staging?
A 3 gram bullet is fired horizontally into and remains in, a 16 kg block of wood suspended by a rope from the ceiling. The block swings in an arc, rising 4mm above its lowest position. What was the
An experimental rocket car moves along a straight track at a constant speed of 900.0m/s. The car passes a group of officials, travels a distance of 270.0 m and then explodes. If the officials hear t
A bag of blood with a density of 1050 kg/m^3 is raised about 1.00 m higher than the level of a patient's arm. How much greater is the blood pressure at the patient's arm than it would be if the bag
What is the car's maximum speed on an incline of 1 in 20 (ie, if theta is the angle of the incline with the horizontal, sin = 1/20)?
A treasure map directs you to start at a palm tree and walk due north for 15.0m. You are then to turn 900 and walk 22.0m; the turn 900 again and walk 5.00m. Give the distance from the palm tree and
A 83g arrow is fired from a bow whose string exerts an average force of 125N on the arrow over a distance of 81cm. What is the speed of the arrow as it leaves the bow?