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As two trains move along a track, their conductors suddenly notice that they are headed toward each other. The figure gives their velocities v as functions of time t as the conductors slow the trains. The figure's vertical scaling is set by vs = 40.0 m/s. The slowing processes begin when the trains are 202 m apart. What is their separation when both trains have stopped?
A circular loop carries a current I = 20A, and the magnetic energy density at the loop's center is equal to 6 mJ/m^3. What is the radius of the loop
A 2000 kg car is traveling at a constant 15.0 m/s down a long mountain grade of 2.0%. The mountain road is 5.0 km long. What is the increase in the temperature of the brakes
A 1.00 kg object is attached to a horizontal spring. The spring is initially stretched by 0.2 m, obtain the maximum speed of the object
You are the design engineer in charge of the crashworthiness of new automobile models. What is the average force acting on the car by the inner barrier
A 5.7-kg block of aluminum is heated from 30°C to 70°C at atmospheric pressure. Find the amount of energy transferred to it by heat
The rms speed of a sample of gas is increased by 3 percent. What is the percent change in the pressure of the gas
A flight attendant pulls her 70.0N flight bag a distance of 244 m along a level airport floor at a constant speed. The force she exerts is 36N at an angle of 52° above the horizontal. Find the work she does on the flight bag.
The Space Shuttle travels at a speed of about 7.60 103 m/s. How many football fields (length = 91.4 m) does the Shuttle cover in the blink of an eye
The left ventricle of the heart accelerates blood from rest to a velocity of + 20.8 cm/s. How much time does blood take to reach its final velocity
The first puck is deflected 38 below the +x axis and moves off at 0.37 m/s. Find out the speed and direction of the second puck after the collision.
A projectile proton with a speed of v collides elastically with a target proton initially at rest. what is the speed of the projectile proton
A copper wire has diameter 0.140mm and length 11.0cm . It's in a horizontal plane and carries a current of 2.50A, Find the magnitude of the magnetic field needed to suspend the wire against gravity.
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