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A person travels in a car with a speed of 90 m/s. To get the driver's attention, a stationary police officer behind the car shines his spotlight at the car. If the officer is 270 m behind the car when he turns on his spotlight, how long does it take for the light to reach the car? An astronaut travels at a speed of 0.98c from the Earth to a distant star that is 6.2 1017 m away. If the astronaut is 33 years old when she begins her trip, how old is she when she arrives at the star?
With what minimum speed must you toss a 140 g ball straight up to hit the 14 m -high roof of the gymnasium if you release the ball 1.7 m above the ground, With what speed does the ball hit the ground
Calculate the angular velocity the flywheel must have to contain enough energy to take the bus from rest to a speed of 27.0 m/s, assuming 83.0% of the rotational kinetic energy can be transformed into translational energy
A square plate is 2.4 × 10^-2 m thick, measures 4.5 × 10^-2 m on a side, and has a mass of 7.2 × 10^-2 kg. determine the maximum possible amount of shear strain
The length of the ice block is L1 = 0.00484 m and its temperature is T1 = -11.0 °C. The aluminum block is L2 = 0.00139 m long, Calculate the heat per second per square meter
The statue of Isaac Newton is crated and moved from the Oxford Museum of Natural History and Science for cleaning. find the normal force between the ramp and the crate
A mechanic pushes a 3.4 103 kg car from rest to a speed of v, doing 5000 J of work in the process. During this time, the car moves 26.0 m. find the horizontal force exerted on the car
You have a small electromagnet that consumes 300 W from a residential circuit delivering 120 V at 60.0 Hz. What is the internal resistance of the electromagnet
a car driving on the turnpike accelerates uniformly from 84.0 ft/s (57.3 mph) to 112 ft/s (76.4 mph) in 3.60s. what is the cars acceleration
A damped mass-spring system oscillates at 140 Hz. The time steady of the system is 2.0 s. At t = 0, the amplitude of oscillation is 8.6 cm and the energy of the oscillating system is after that 86 J.
A space vehicle is coasting at a constant velocity of 20.6 m/s in the +y direction relative to a space station. determine the magnitude of the vehicle's velocity
A uniform disk with mass 43.1 kg and radius 0.230 m is pivoted at its center about a horizontal, frictionless axle that is stationary. What is the magnitude a of the resultant acceleration of a point on the rim of the disk after the disk has turned..
An automobile weighing 2000lbs travels due west at a constand speed of 70 mph. The magnetic field in the area is a constant 2.5 µT due north. What is the normal force on the car
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