Mechanics | Relativity Answers

An electron with initial velocity v0 = 1.95 × 105 m/s enters a region 1.0 cm long where it is electrically accelerated (see the figure). It emerges with velocity v = 5.08 × 106 m/s. What is its acceleration, assumed constant? (Such a process occurs in conventional television sets.)

If a coin initially lands heads up and then it’s flipped and goes straight up from a table with initial velocity v=3m/s. It rotates in the air with angular velocity ω=20 rad/s and falls back down to the table. Does the coin land heads or tails? Ignore air resistance. I’m having a hard time answering this question and I can’t seem to find a formula to use!

with the 12" diameter regulation softball (not sure on actual weight...possibly 6 oz)...going from home plate to 2nd base in the time of 1.46 seconds...the speed is__________....then convert down the size and weight to a baseball and to the dimensions of the baseball length...not just the time/distance to get the speed of the throw....but how fast and at what clocked time would it be if it were a regulation baseball thrown the same way on the dimensions of a baseball field's 2nd base?
In Softball, from home plate to 2nd base the distance is 84 feet 10 1/4 inches. In Baseball, the same distance is 127 feet, 3 and 3/8 inches.
Can someone please convert this from Softball to what it would be equivalent to in Baseball?

What is the elapsed time for a 3rd observer in the Twin Paradox who remains stationary with respect to the centre of mass? My conjecture is t3 = gamma1 * t2 = gamma2 * t2, with velocities reckoned with respect to the 3rd observer.

A 50.0 kg person is walking horizontally with a constant acceleration of 0.25 m/s2 inside an elevator. The elevator is also accelerating downward at a rate of 1.0 m/s2. Find the force of friction between his shoes and the floor of the elevator. What minimum force of friction between his shoes and the floor would make this scenario possible?

A duck has a mass of 2.5 kg. As the duck paddles, a force of 0.10 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.20 N in a direction of 52o south of east.

Determine the net force on the duck.
Determine the acceleration of the duck.

a coin sits on the edge of a turntable platform with a diameter of 40.0 cm. The turntable is the turned on and slowly accelerates till the coin slips off. If the coefficent of static friction between the coin and the turn table is .5, then what was the instantaneous frequency that the turntable was spinning at when the coin flew off the turntable?

Leo (70 Kg) stretches the trampoline mat by 37 cm. Calculate the elastic potential energy he puts into the trampoline mat.

A train traveling at 7.55 m/s accelerates to a distance of 975 m in 31.5 s. What is the final velocity of the train?

The wheel, rotating at uniformly accelerated speed, after a time t =1min after the start of rotation, acquires a frequency on n=720rmp. Find the angular acceleration e of the wheel and number of revolutions N of the wheel during this time