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A 2000 kg car starts at rest at the bottom of a hill. The road is flat at an angle of 5.22% with the horizontal. Accelerating at a constant rate, the car reaches the top of the hill after traveling 1.22 km with a speed if 25.4 m/s. The average frictional force (air and road) on the way up the hill is 1220 Newtons. Find the power the car needs to do this.
Consider a violin string with a vibrating length of 30 cm. If the speed of a wave on this string is 250 m/s, what is the tension in the string? Hint: You will have to estimate the diameter of the string. Assume the density is the same as that of s..
A thin, uniformly charged spherical shell has a potential of 720 V on its surface. Outside sphere, at a radial distance of 29.0 cm from this surface, the potential is 434 V.
One method for measuring the speed of sound uses standing waves. A cylindrical tube is open at both ends, and one end admits sound from a tuning fork. What is the speed of sound in the gas in the tube
A 65kg, 1.70m tall person is standing in a room, Find the air temperature at which the heat transfer rate by radiation is just balanced by the rate of heat generation
Assume the bat is a wooden rod of uniform diameter and take the pivot point to be in the middle of the bat, at the end of the bat, Calculate the moment of inertia of a baseball bat
What is the minimal mass of helium (density 0.18) needed to lift a balloon carrying two people in a basket, if the total mass of people, basket, and balloon (but not gas) is 320.
a block of wood of mass m1= 1 kg slides to the right on a frictionless horizontal table with a speed of 30 m/s. how much is the spring compressed by the wood
A resonant circuit in a radio receiver is tuned to a certain station when the inductor has a value of 0.311 mH and the capacitor has a value of 16.4 pF. Calculate the frequency of the radio station.?
A pair of speakers separated by 0.7 m is driven by the same oscillator at a frequency of 674Hz. An observer, first positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the speakers. (Assume the speed of ..
On vacation, your 1350 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 2.15 m/s2. (a) What is the net force exerted on the trailer? (b) What force does the trailer exert on the car? (c) What is the net force acting on ..
A rigid vessel contains ammonia as liquid and vapor in equilibrium at 8 bar with a quality of 0.02. The mass of liquid ammonia is 1000 kg. How much volume does the liquid ammonia occupy
When starting a foot race, a 70.0-kg sprinter exerts an average force of 650 N backward on the ground for 0.800 s. What is his final speed
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