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A visible disturbance propagates around a crowded soccer stadium when fans, section by section, jump up and then sit back down. What type of wave is this?
An electron is released from rest in a uniform electric field and accelerates to the north at a rate of 180m/s^2. What is the magnitude of the electric field in (N/C)? What is the direction of the electric field?
A 7 g bullet collides horizonally with a 43 g block resting on a frictionless horizontal surface as shown in the accompany diagram. The bullet remain embedded in the block and subsequently causes the block to slide down a frictionless slope onto a..
.250 kg ball is dropped to the floor from a height of 1.0 m and upon rebounding, reaches a height of .60 m. What is the impulse delivered to the ball by the floor?
How much work did the movers do (horizontally) pushing a 150- crate 10.2 across a rough floor without acceleration, if an effective coefficient of friction was 0.50.
The two forces in each pair could have different physical origins (for instance, one of the forces could be due to gravity, and its pair force might be due to friction or electric charge).
Time standards are now based on atomic clocks. A promising second standard is based on pulsars, which are rotating neutron stars (highly compact stars consisting only of neutrons).
A 60kg bicyclist rides his 7.8kg bicycle with a speed of 16m/s. How much work must be done by the brakes to bring the bike and rider to a stop.
A 71kg pole-vaulter falls from rest from a height of 4.6m onto a foam-rubber pad. The pole-vaulter comes to rest 0.4s after landing on the pad.
the coyote accidentally runs off the edge of a cliff and plummets to the ground 30.0 m below. Illustrate what force does the ground exert on the coyote as he makes a coyote-shaped dent 0.420 m deep in the ground?
A rock is tossed straight up with a velocity of 23 m/s When it returns, it falls into a hole 10m deep, What is the rock's velocity as it hits the bottom of the hole
A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Each time the pulsar makes one revolution, the rotation beam sweeps across the earth, & the earth receives a pulse of radio waves. ..
Density-Gravity Problem: a) Planet Vulcan has twice the mass of Earth and the same radius. What are its volume, density and surface gravity compared to Earth?
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