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An automobile of mass 3000 kg is driven into a brick wall in a safety test. The bumper behaves like a Hooke's-law spring. It has an effective spring constant of 6 × 106 N/m, and is observed to compress a distance of 3.95 cm as the car is brought to rest. What was the initial speed of the automobile? Answer in units of m/s
A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of -0.4 µC. How many electrons are transferred from the wool shirt to the plastic rod
A 115 V fish-tank heater is rated at 120 W, Calculate the current through the heater when it is operating
A ball is tossed from an upper-story window of a building. The ballis given an initial velocity of 8.70m/s at an angle of 21.0° below the horizontal. It strikes the ground6.00 s later.
Calculate the acceleration of an electron that moves through the same magnetic field as in the example, as the same velocity as the proton
A rubber ball of mass m falls straight down and bounces off the floor with equal incoming and outgoing speeds v. What is the magnitude of the impulse on the ball
A Goodyear blimp typically contains 6580 m3 of helium(He) at an absolute pressure of 1.10 x 105 Pa. Thetemperature of the helium is 275 K. What is the mass (in kg) of the helium in the blimp?
A 15.0-mlength of wire consists of 6.0mof copper followed by 9.0mof aluminum, both of diameter1.3mm.A voltage difference of 95mVis placed across the composite wire. The resistivity of copper is1.68×10-8Ω⋅mand the resistivity of aluminum is2.65×10-..
a car moves at a constant speed on a strait but hilly road. One section has a crest and dip of the same 500 m diameter curve. what is the greatest speed at which the car can move without leaving the road at the top of the first crest
A solenoid with 1000 turns has a cross-sectional area of 7.0cm2 and a length of 25cm. how much energy is stored in the magnetic field of the solenoid
Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Assume the orbit to be circular and 360 km above the surface of the Moon, where the acceleration due to gravity is 1.16 m/s2. The radius of the Moo..
Read the articles on the Pioneer spacecraft anomaly. How does this affect Newton's law of universal gravitation?
A particle moves along the curve y=cos(x) from x=0 to x=?/2 under the action of the force F=(3xN)i+(4yN)j. Determine the work done by the force on the particle
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