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A 3 kg box is pushed across a frictionless horizontal floor with a force F = 20 N that makes an angle of 25° with the horizontal. The box moves 18 m. 1) What is the work done by the force F? 529 J 360 J 326 J 210 J 0 J 2) What is the work done by the force of gravity acting on the box? 529 J 360 J 326 J 210 J 0 J 3) What is the work done by the normal force acting on the box? 529 J 360 J 326 J 210 J 0 J 4) If the box starts at rest, what is the final speed of the box? 12.3 m/s 14.7 m/s 16.0 m/s 18.0 m/s 21.9 m/s A 3 kg box is pushed across a horizontal floor WITH FRICTION by a force F = 20 N that is parallel to the floor. The box moves 18 m. The box moves with CONSTANT SPEED. 5) What is the work done by the force F? 529 J -529 J 360 J -360 J 0 J 6) What is the work done by the force of friction acting on the box? 529 J -529 J 360 J -360 J 0 J A skier with a mass of 50 kg starts from the top of a hill (at rest) at height h above ground. The skier glides down the hill to point A where her velocity is vA = 20 m/s and continues up a second hill 8 meters high and back down the other side. Her entire trip up to point C is frictionless. At point C she begins stopping and comes to a complete stop 48 meters later at point D. 7) What is the height h of the first hill? h = 12.8 m h = 32.5 m h = 16.5 m h = 28.6 m h = 20.4 m 8) What is the speed of the skier at point B? 0 m/s 12.8 m/s 15.6 m/s 18.3 m/s 20 m/s 9) What is the speed of the skier at point C? 0 m/s 12.8 m/s 15.6 m/s 18.3 m/s 20 m/s 10) When coming down the first hill, at what height off the ground will the SPEED of the skier be half of its value at point A? at a distance h off the ground at a distance .75h off the ground at a distance .5h off the ground at a distance .25h off the ground 11) What is the magnitude of the work done by friction on the skier in stopping her? W = 10000 J W = 11200 J W = 12300 J W = 12300 J W = 12300 J 12) What is the coefficient of friction in the region from C to D? .425 .587 .615 .736 .822 13) If the mass of the skier were doubled how would the speed at point A change? increase remain the same decrease 14) If the mass of the skier were doubled how would the stopping distance change? increase remain the same decrease 15) If the mass of the skier were doubled how would the magnitude of the work done by friction change? increase remain the same decrease
It is possible to use electromagnetic radiation to ionize atoms. To do so, the atoms must absorb the radiation, What is the longest radiation wavelegth
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The dipole is held perpendicular to a uniform electric field with field strength 980V/m , then released. What is the dipole's angular velocity at the instant it is aligned with the electric field?
A ten pound car wheel has a moment of inertia of 0.38 kg m2. What is the wheel's rotational kinetic energy
Why does a shirt or blouse taken from a clothes dryer sometimes cling to your body?
Starting with an initial speed of 5.00 m/s at a height of 0.335 m, a 1.50-kg ball swings downward and strikes a 4.60-kg ball that is at rest, How high does each ball swing after the collision
The electric field near the middle of a long, thin, uniformly charged rod is 3.6x10^4 N/C at a distance of 9.50 cm from the rod. If the rod's length is 17.8 m
A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. What is the volume flow rate through the pipe
A 1850-kg car experiences a combined force of air resistance, At what angle is the hill inclined above the horizontal
The jet accelerates uniformly, and during that time, the pendulum oscillates about the equilibrium position shown by the solid line, with D = 0.370 m. find the magnitude of the plane's acceleration.
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