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A man pushes a 50N box across a level floor at a constant speed of 2.0 m/s for 10 s. Find the average power output by the man. (Show all work please)
The telescope at Yerkes Observatory in Wisconsin has an objective whose focal length is 19.4 m. Its eyepiece has a focal length of 10.0 cm. What is the angular magnification of the telescope
A 1.7 kg rolling hoop with a radius of 9 cm rolls without slipping. If the angular speed of the hoop is 2.46 rad/s , compute rotational kinetic energy of the rolling hoop
A chair of weight 74.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 47.0 N directed at an angle of 41.0^circ below the horizontal and the chair slides along floor.
A thermos contains 159 cm3 of coffee at 93.7 °C. To cool the coffee, you drop two 13.2-g ice cubes into the thermos. The ice cubes are initially at 0 °C and melt completely. What is the final temperature of the coffee in degrees Celsius? Treat the..
Calculate the electric flux through the circle when its face is perpendicular to the field lines and then when at 45 degrees to the field lines
A 4.95-kg ball, moving to the right at a velocity of +1.60 m/s on a frictionless table, Find the final velocities of the balls if the collision meet the following conditions
an electron microscope accelerates an electron (mass of electron is 9.11x10^-31 kg) from rest to 2.8 x 10^7 m/s in a distance of 2.80 cm, what is the average force on the electron
A block of mass m is attached to a string that is wrapped around the circumference of a wheel of radius R and moment of inertia I. Find the moment of inertia of the wheel if its radius is 8.0 cm
A 1.50 V battery supplies 0.350 W of power to a small flashlight for 20.0 min. How much charge does it move
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -16.30 eV. What is the energy of the first photon emitted
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.65 104 m/s, What is the orbital speed of the second satellite
At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.2 m/s2, How fast will the automobile be traveling at that instant
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