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A 50-kg person steps on a scale in an elevator that is moving upward. The scale reads 512.5 N. What is the magnitude in m/s2 of the acceleration of the elevator?
Four protons and four electrons are located inside a pyramid and are separate from each other, What is the net value of electric flux through the surface of the pyramid
An air bubble of 10 cm^3 is created at bottom of a lake, where the temperature is 5 degree celsius and is 100 m deep. what is the pressure at the bottom
One end of a wire is attached to a ceiling, and a solid brass ball is tied to the lower end. The tension in the wire is 140 N. What is the radius of the brass ball
How much charge does a battery have to supply to a 5.00 µF capacitor to create a potential difference of 1.20V across its plates
Two loudspeakers in a 20°C room emit 629 Hz sound waves along the x-axis, If the speakers are out of phase, what is the smallest distance between the speakers for which the interference of the sound waves is constructive
question 1two astronauts yuri and valentina are flying their rockets towards each other both at a speed of 09c as
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.20×10^6N , one at an angle 17.0 degrees west of north, What is the total work done by the two tugboats on the supertanker
What is the magnitude of the apparent weight of a 83 astronaut 4600 from the center of Earth's Moon in a space vehicle moving at constant velocity.
In compressing the spring in a toy dart gun, 0.6 J of work is done. When the gun is fired, the spring gives its potential energy to a dart with a mass of 0.08 kg, What is the dart's speed
A wooden raft has a mass of 45 kg. When empty it floats in water (density 1000 kg/m3) with 68% of its volume submerged. What mass of sand could be put on the raft without it sinking.
Seat belts and air bags save lives by reducing the forces exerted on the driver, A 58kg person is in a head-on collision. The car's speed at impact is 13m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air ..
A baseball pitcher can throw a ball with a speed of 40m/s . He is in the back of a pickup truck that is driving away from you. What is the speed of the truck
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