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A spotlight on a boat is a = 2.1 m above the water, and the light strikes the water at a point that is x = 7.8 m horizontally displaced from the spotlight (see the drawing). The depth of the water i
A 64-cm diameter wheel accelerates uniformly about its center from 130 rpm to 280 rpm in 4.0s. Determine the angular acceleration and the radial and tangential components of the linear acceleration
A heavy ball with a weight of 120 is hung from the ceiling of a lecture hall on a 4.8--long rope. The ball is pulled to one side and released to swing as a pendulum, reaching a speed of 5.3 as it p
Calculate the p.d. across the parallel capacitors and the energy stored in the capacitors before AND after being connected in parallel. Explain the difference.
A projectile is launched straight up at 141 m/s. How fast is it moving at the top of its trajectory? Suppose it is launched upward at 45 degrees above the horizontal plane. How fast is it moving at
The light reflected from a film as in (a) is analysed with a spectrometer. What are the orders of interference of the two minima involved?
A pitcher throws a 0.164-kg baseball, and it approaches the bat at a speed of 56.6 m/s. The bat does 68.3 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the bal
You set two parallel slits 0.2 mm apart at a distance of 1 m from a screen. The distance between the first and second dark lines of interference pattern on the screen is?
A 13 g bullet traveling 235 m/s penetrates a 2.0 kg block of wood and emerges cleanly at 179 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bulle
A 5.00-m-long, 480 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 74.0 kg construction worker stands at the far e
Two girders are made of the same material. Girder A is 5.5 times as long as girder B and has a cross-sectional area that is 8.9 times as great. What is the ratio of the mass density of girder A to t
A bicycle pump contains air at STP. What is the new pressure of the air in the chamber after the first stroke, assuming no temperature change?
Iron has a density of 7.87 g/cm3 and the mass of an iron atom is 8.20 x 10-26 Kg. If the atoms are spherical and tightly packed, what is the volume of an iron atom? (Your answer must have correct si
The bullet becomes embedded in the block. If the bullet-block system compresses the spring by a maximum of 90.0 cm, what was the speed of the bullet at impact with the block?
A bubble having a diameter of 76 cm is released from a depth of 4.7 m from the bottom of a swimming pool. What will the diameter of the bubble be when it reaches the surface?
A 67-kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.19. What would be the magnitude of the acceleration?
How many atoms of helium gas are required to fill a balloon to diameter 32 cm at 77?C and 1.271 atm? What is the average kinetic energy of each helium atom?
Block is tied to a string that is wrapped around the rim of a pulley of radius 7.5 . The block is released from rest. Assuming the pulley is a uniform disk with a mass of 0.31 , find the speed of t
A room has its walls aligned accurately with respect to north, south, east, and west. Find the fluxes through the north wall, the east wall, and the floor.
1.5 block is tied to a string that is wrapped around the rim of a pulley of radius 7.5 . The block is released from rest. Assuming the pulley is a uniform disk with a mass of 0.31 , find the speed
How fast is it moving at the top of its trajectory? Suppose it is fixed upward at 45 abouve the horizontal plane. How fast is it moving at the top of its curved trajectory? Explain.
Suppose the speakers are reconnected so that the 471 sounds they emit are exactly out of phase. At what positions are the intensity maximum and minimum now?
The glider is pushed in 8.2 cm and released. A student with a stopwatch finds that 14 oscillations take 17.0. What is the spring constant?
A heavy ball with a weight of 150 is hung from the ceiling of a lecture hall on a 4.0--long rope. The ball is pulled to one side and released to swing as a pendulum, reaching a speed of 5.6 as it pa
A NASA satellite has just observed an asteroid that is on a collision course with the Earth. With what speed will it hit the Earth's surface, neglecting friction with the atmosphere?