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A car is moving at 100.0 km/hr in a straight line. the drivers steps on the breaks, and the car stops in 2.75 sec. what is the acceleration of the car (uniform acceleration)
A 10-m-long glider with a mass of 780kg(including the passengers) is gliding horizontally through the air at 30m/s when a 70Kg skydiver drops out by releasing his grip on the glider. What is the glider's speed
a free electron and a free proton are exactly 1.3 cm apart.a find the magnitude of the acceleration of the proton.
Starting from one oasis, a camel walks 25 km in a direction of 30 degrees south of west and then walks 30 km toward the north to a second oasis. What is the direction from the first oasis to the second oasis?
A 1.6 kg mass (initially at rest) compresses a spring (spring constant 1900 N/m) by 5×10?2 m, and is released. After colliding and sticking together, the two masses move up a frictionless inclined plane. What is the maximum height achieved by the ..
Two spherical objects have a combined mass of 190 kg. The gravitational attraction between them is 8.26×10?6 N when their centers are 17.0 cm apart. What is the mass of the heavier object
a roller coaster is initially at a height of 40 m above the ground and has an initial velocity of 15 ms. using
A car moving at 38 m/s passes a highway patrol car moving at 24 m/s . The microwaves produced by the radar gun in the patrol car have a frequency of 8.25x10^9 Hz. What is the magnitude of the difference in frequency between the waves emitted by the g..
A machine shop has 100 equally noisy machines that together produce an intensity level of 90 dB. how many machines must be turned off
A barefoot field-goal kicker imparts a speed of 49 m/s to a football initially at rest. find the force exerted by the ball on the kicker's foot
Calculate the orbital radius of an electron in the n=99 state of hydrogen. Calculate the orbital radius of an electron in the n=100 state of hydrogen. Calculate the speed of an electron in the n=99 state of hydrogen. Calculate the speed of an electro..
What is the coefficient of kinetic friction between sled and incline? (Enter 0 if sled does not move.)
An electric heater used to boil small amounts of water consistsof a 15-Ω coil that is immersed directly in the water. Itoperates from a 120-V socket. How much times is required for thsiheater to raise the temperature of 0.5 kg of water from 13degrees..
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