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A father pulls his children in a wagon for 25 minutes covering 1.25 miles on a level sidewalk. He pulls with an average force of 35 lpf at an angle of 45 degrees to the sidewalk. How much work is done (lb*ft)?
What is the average horsepower required?
A plane accelerates from rest at a constant rate of 5.00 along a runway that is 1800 long. What is the time needed to take off
Calculate the de Broglie wavelength for an alpha particle (He-e nucleus) with energy E = 4.2 GeV (which is emitted in the radioactive decay of U-238)
A beaker containing 300mL of water at 20 clesius has a 150g piece of Aluminum at 50 celsius placed in it. What is the final equilibrium temp of the water and aluminum
a 245 kg person lays on board that is supported only on the ends and that has a mass of 12.0 kg. if the person and the
A person whose eyes are 1.75m above the floor stands in front of the plane mirror. The top of her head is 0.11.
Two thin beams are joined end-to-end as shown in the figure to make a single object. What is the gravitational torque on the object
A 7 kg sled is initially at rest on a horizontal road. The sled is pulled a distance of 3.5 m by a force of 37 N applied to the sled at an angle of 30o to the horizontal
A vertical wall (5.4 m 2.4 m) in a house faces due east. A uniform electric field has a magnitude of 164 N/C. What is the electric flux through the wall
A simple pendulum has mass 1.28 kg and length 0.600 m. What is the period of the pendulum near the surface of Earth
A 200 W speaker is playing at full power. The speaker is at the center of a 1 m radius spherical chamber. What is the total sound power that reaches the walls
The loss of heat to the external environment is negligible. When equilibrium is established, the temperature is 30.0°C. Illustrate what is the specific heat capacity of the specimen?
In a spherical metal shell of radius R, an electron is shot from the center directly toward a tiny hole in the shell, What is the magnitude of the electron's acceleration
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