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Q. A 2.1 x 10^3 kg car starts from rest at the top of a driveway that is sloped at an angle of 20.0 degrees with the horizontal. An average friction force of 4.0 x 10^3 N impedes the car's motion so that the car's speed at the bottom of the driveway is 3.8 m/s. What is the lenght of the driveway?
Q. An electric field = (89000 N/C, right) causes the ball in the figure below to hang at a 20° angle. The ball's mass is 4.7 g. What is the charge on the ball?
A fighter jet is launched from an aircraft carrier with the aid of its own engines & a steam-powered catapult. The thrust of its engines is 2.3 x 105 N. In being launched from rest it moves through a distance of 87 m & has a kinetic energy of 4.5 ..
assume you would enter a vacuum chamber (on Earth), that is, a chamber with no air in it. Inside this chamber, if you dropped a hammer and a feather from the same height at the same time, both would hit the bottom at the same time.
What is the velocity of 5.5kg object with a force of 2.5N while it reaches 6.0 meters, assuming the velocity at zero meters is zero.
What is the physics behind everyday sayings
A cord is wrapped around the rim of a solid uniform wheel 0.300 in radius and of mass 7.80 . A steady horizontal pull of 40.0 to the right is exerted on cord, pulling it off tangentially from the wheel. The wheel is mounted on frictionless bearing..
A 29 g rifle bullet travelling 270 m/s buries itself in a 3.50 kg pendulum hanging on a 2.6 m long string, which makes pendulum swing upward in an arc. Find out the horizontal component of the pendulum's displacement.
Two long, parallel conductors carry currents I1 = 3.10 A and I2 = 5.10 A, both directed into the plane of the computer screen. Find out the magnitude and direction of the resultant magnetic field at a point midway between the wires. (b) Find out the ..
Estimate the change in COP of your electric food freezer when it is removed from your kitchen to its new location in your basement, which is 8 C° cooler than your kitchen. (Assume that the temperature in the kitchen is 20°C and that the temperature o..
A car travelling at 37 {rm m/s} runs out of gas while travelling up a 7.0{rm ^ {circ}} slope. How far would it coast before starting to roll back down.
Two wires are tied to the 500 sphere. The sphere revolves in a horiIzontal circle at a constant speed of 6.8.
A worker on scaffolding 65 ft above the ground needs to lift a 340 lb bucket of cement from ground to a point 30 feet above the ground by pulling on a rope weighing 5 lb/ft. How much work is required.
Find out the frequency of the fourth harmonic if the string is fixed at one end and free at other. (That is, if the free end is attached to a long string of negligible mass.)
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