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A proton is moving parallel to a uniform electric field. The electric field accelerates the proton and increases its linear momentum to 8.9 x 10-23 kg·m/s from 2.9 x 10-23 kg·m/s in a time of 9.1 x 10-6 s. What is the magnitude of the electric field?
A bat at rest sends out ultrasonic sound waves at 49.4kHz, What is the received sound frequency
A counter with negligible background gives exactly 10,000 counts in a 1-s period when a standard source is in place. What is the counter dead time
A ball is thrown vertically upward with a speed of 15.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is i..
A professional race-car driver buys a car that can accelerate at 5.3 m/s2. Find the velocity of the race car when the two drivers are side by side
Two ice skaters push off of one another. Paul has a mass of 65 kg and an acceleration of 5 m/s2 south. Tom has a mass of 75 kg, what is his acceleration
why do you only report 2 sigfigs when calculating freezing point
estimate the speed of the car just before braking. how much time passes before the brick lands on the ground..
Suppose the barrel has a length of 0.511 m and an opening whose radius is 2.55 x 10-3 m. A bullet (mass = 2.6 x 10-3 kg) has a speed of 433 m/s after passing through this barrel. Ignore friction and determine the average pressure of the expanding ..
Two insulating spheres have radii r1 and r2, masses m1 and m2, and uniformly distributed charges -q1 and q2. How fast is each moving when they collide
A space vehicle is traveling at 3570 km/h relative to Earth when the exhausted rocket motor is disengaged, What is the speed (in km/h) of the command module relative to Earth just after the separation
A car plus its driver has a mass of 1400 kg. when the driver takes his foot off the accelerator, the car slows from 30 m s^-1 to 20 m s^-1 in 20 s. how much work was done by dissipative forces
Under standard conditions, the density of air is 1.293 kg/m3 and that of helium is 0.178 kg/m3, What must be the minimum diameter of the spherical balloon
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