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A 577 Hertz sound wave travels through a substance. The wavelength of the sound wave is measured to be 2 m. Evaluate what the speed of sound in the substance?
A 1870 kg truck traveling north at 37 km/h turns east and accelerates to 52 km/h. (a) What is the change in the truck's kinetic energy? (b) What is the magnitude of the change in its momentum?
A 2070 kg railroad flatcar, which can move with negligible friction, is motionless next to a platform. What is the speed of the flatcar if he then stands on it
A small piece of rock is weighed in air and then weighed while immersed in oil of density 800 kg/m3. If the weight in air is 21.5 N and the weight in the oil is 11.8 N, calculate the density of the rock
How much time is necessary for the torso to come to rest
A satellite is in a circular orbit around an unknown planet. Thesatellite has a speed of 1.55 x 104 m/s, and the radius of the orbit is5.10 x 106 m. What is the orbital speed of the second satellite
Two small plastic spheres each have a mass of 2.0 g and a charge of -50.0 nC. They are placed 2.0 cm apart. What is the magnitude of the electric force between the spheres? Express your answer using two significant figures.
A high school kicker makes a 34.0yd field goal attempt (in American football) and hits the crossbar at a height of 12.0ft. What is the magnitude of the net displacement of the football from the time it leaves the ground until it hits the crossbar? Wh..
A 66-N ? m torque acts on a wheel with a moment of inertia 175 kg ? m2. If the wheel starts from rest, how long will it take the wheel to make one revolution
A duck is floating on a lake with 28% of its volume beneath the water. What is the average density of the duck
A boy uses a slingshot to launch a pebble straight up into the air. The pebble reaches a height of 24.0 m above the launch point 2.3 seconds later, What was the pebble's initial speed
A woman stands in an elevator that has a constant upwardacceleration while the elevator travels upward a distance of18.0 m. What is the acceleration of the elevator
You need to move a 122 kilogram sofa to a different location in the room. It takes a force of 99 Newton to start it moving. Find coefficient of static friction between sofa and carpet
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