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A 25 kg mass moves with 25 m/s. Now a brake system brings the mass to a complete stop with a constant deceleration over a period of 5 seconds. The brake energy is absorbed by 0.5 kg water initially at 20oC, 100 kPa. Assume the mass is at constant P and T. Find the energy the brake removes from the mass and the temperature increase of the water, assuming P = C.
An AC generator supplies an rms voltage of 240 V at 60.0 Hz. It is connected in series with a 0.450 H inductor, a 3.90 ?F capacitor and a 316 ? resistor. What is the peak voltage across the inductor
two balls 14 cm in diameter are placed 200 m apart on a frictionless horizontal plane at 50ordm n on the rotating
Far in space, where gravity is negligible, a 480-kg rocket travelling at 95 m/s fires its engines. The figure shows the thrust force as a function of time. The mass lost by the rocket all through these 30s is negligible.
Ricardo and Maria both move to the center of the canoe. Ricardo notices that the canoe moves a distance d = 0.37 m relative to a rock that is stationary in the water. What is Maria's mass in kg
A 5.5kg block is initially at rest on a frictionless horizontal surface. It is pulled with constant horizontal force of 3.8 newtons. How far does it move in this time
What is the acceleration of the car
block 2 (mass 1.0 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of springconstant 200 N/m. The other end of the spring is fixed to a wall.Block 1 (mass 2.0 kg), traveling at speed 4 m/s, collides with block..
A 287kg box is pulled at a constant speed by the little engine. The box moves a distance of 2.4 m across the horizontal surface. (µk=.20), How much energy is transferred by the engine
A 2.0-kg block is attached to a spring with a spring constant of 24N/m. If the spring is stretched 10 cm from its equilibrium position and released from rest, the maxium velocity attained by the mass is?
A spiral density wave refers to a region of enhanced density inthe Galaxy which rotates more slowly than the stars and gas. As far as an astronomer is concerned, a metal refersto. Where are the majority of older, metal-poor stars found in theMilky Wa..
Determine the direction of the net electrostatic force on charge q3 (angle with respect to the positive x-axis).
An initially uncharged 3.87-?F capacitor and a 6.99-k? resistor are connected in series to a 1.50-V battery that has negligible internal resistance. What is the initial current in the circuit, expressed in milliamperes?
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