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A 54.2 g block of copper whose temperature is 400 K is placed in an insulating box with a 120 g block of lead whose temperature is 200 K. What is the change in the entropy of the system
A Carnot engine operates between 235°C and 125°C, absorbing 6.30 ? 104 J per cycle at the higher temperature. How much work per cycle is this engine capable of performing
An air conditioner operating between 86°F and 72°F is rated at 4000 Btu/h cooling capacity. What horsepower is required of the air conditioner motor
A water tower, vented to the atmosphere, is drained by a pipe that extends to the ground. what is the absolute pressure in the drain pipe at ground level
Consider an LC circuit with L = 13 mH and C = 2285 pF. At what frequency is the reactance of the inductor equal to the reactance of the capacitor
Three resistors with values 1.2 , 2.3 , and 5.0 , respectively, are connected in parallel in a circuit with a 5.0 V battery, what is the pwer delivered to the 5 ohm resistor
In a tennis serve, a 0.073-kg ball can be accelerated from rest to 41 m/s over a distance of 0.95 m. Find the magnitude of the average force exerted by the racket
A pendulum of mass 0.25 kg and length L= 1.0 m is attached to a line which is fixed at point P, determine the force of tension in the line
One fires a bullet (m=50g) at a block of wood (m=2kg) resting on a frictionless surface. How much energy is lost
From the shore of a frozen lake, Eli Manning throws a 2 kg football at a velocity of 20 m/s. What is their velocity immediately after they catch it
A 100 g bullet is shot into a 1 kg sphere of wood, where it sticks. What is maximum initial speed the projectile can have
A rubber ball of mass 39.0 g is dropped from a height of 1.80 m onto a floor. find impulse was applied to the ball during the collision
A mass m = 14 kg is pulled along a horizontal floor, with a coefficient of kinetic friction ?k = 0.09, for a distance d = 7.9 m. What is the work done by tension before the block gets to the incline
A car of mass 1.00×103kg and a truck of mass 4.10×103kg run into one another due to ice on the road. Calculate the size of the force on the car due to the truck at that time
You would like to store 8.6J of energy in the magnetic field of a solenoid. What is the magnitude of the magnetic field inside the solenoid
A circular solenoid contains 100 turns of wire and carries a current of 2 amps. Calculate the magnetic flux through one turn of the wire making the solenoid
A 20-kg block and a 10-kg ball are hung from the ceiling through a pulley as shown below, calculate the acceleration of the ball and the block
A straight wire segment 2 m long makes an angle of 30° with a uniform magnetic field of 0.37 T. Find the magnitude of the force on the wire
A block of mass 2.50 kg is pushed 3.00 m along a frictionless horizontal table by a constant 10.0 N force directed 25.0° below the horizontal. Determine the work done by the normal force exerted
A 400 N stun pilot who has been driving his fighter plane vertically pulls out of the dive by changing her course to a circle in a vertical plane. what is the apparent weight of the pilot at the low
An 80 N box initially at rest is pulled by a horizontal rope on a horizontal table. Find the friction force on the box if the pull is 25 N and the box remains at rest
A charge of 20 nC is uniformly distributed along a straight rod of length 4.0 m that is bent into a circular arc with a radius of 2.0 m
A metal rod 6.00 m long is held in a horizontal position. what is the torque exerted on the rod by the tension in the rope
A platform is rotating with an angular speed of 3.00 rad/s and an angular acceleration of 11.0 rad/s2. what is the magnitude of the total acceleration a
A motorcycle, which has an initial linear speed of 8.1 m/s, decelerates to a speed of 1.9 m/s in 6.7 s. find the angular displacement (in rad) of each wheel