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A piece of Styrofoam is completely submerged under water (ρ = 1000 kg/m^3). It is held under because it is attached to a weight whose volume is 0.0002m^3 and whose density is 15000 kg/m^3. While submerged, the system was weighed and the reading on the balance was 2.4 kilogram. The volume of the Styrofoam is 0.001m^3. Evaluate the density of the Styrofoam.
A physical pendulum is constructed using a 2 kg object having a moment of inertia of 25.9 kg-m2 about its center of mass. The rotation (suspension) point is 970.5 cm from the center of mass. What is the period of this physical pendulum?
A 1200 crate slides 15 down a ramp that makes an angle of 30 with the horizontal. If crate slides at a constant speed, how much thermal energy is created?
A 20,000-kg railroad car travels down the track at 30 m/sec and hits a second stationary railroad car of 10,000 kg. Calculate the final velocity of the cars
What is final speed of the block
while standing in a low tunnel you push up on the ceiling with a force of 100N. your mass is 70kg. What force does the floor exert on you
a 1490 kg car has just passed a diner. the closest the car came to the diner was r=40.5, what is the current magnitude of the angular momentum of the car about the diner
5.0kg of water at 32?C is mixed with 5.0kg of water at 52?C in a well-insulated container. Estimate the net change in entropy of the system
A wooden block slides directly down an inclined plane, at a constant velocity of 6.0 m/s. How large is the coefficient of kinetic friction, if the plane makes an angle of 25 degrees with the horizontal?
A 0.100-mA electron beam with kinetic energy of 54.0 eV enters asharply defined region of lower potential where thekinetic energy of the electrons is increased by 10.0 eV. What current is reflected at the boundary
A ball of mass 0.40 kg moves horizontally at a velocity of 25.0 m/s. What was the average force exerted on the ball by the wall
An FM radio station broadcasts at a frequency of 88.1 MHz. The power radiated from the antenna is 50 kW. How many photons per second does the antenna emit
A spring-loaded pellet gun is designed to fire 3.40 g projectiles horizontally at a speed of37.2 m/s. What maximum force is required to load the gun
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