Physics Force & Laws Of Motion Level: High School
Find the tension in the rope and the force a 52.0 kg mountain climber must exert with her feet on the vertical rock face to remain stationary . Assume that the force is exerted parallel to her legs . Assume negligible force exerted by her arms .
Physics Force & Laws Of Motion Level: High School
A shopper pushes a grocery cart by exerting a force on the handle at a downward angle of 35.0 degrees below the horizontal . The loaded cart has a mass of 28.0 kg and the force of friction is 60.0 N(a) What force must the shopper exert to move at a constant velocity ?
Physics Force & Laws Of Motion Level: High School
The other night my wife and I were about ready to push our airplane back into its hanger after an early evening flight . A fueler , who had just refilled our fuel tanks, was going to help guide us as we used a tow-bar to push the plane back . As we were reaching to the tow-bar the fueler asked how we could actually be able push the plane in. He cited Newtons third Law of Motion as the reason, explaining that when we push on the plane, the plane will pull back on us with an equal force , the force will cancel , and there will be no motion . Thus, we shouldn't be able to push the plane into place . What is wrong with the fuelers argument and what would you say that would be the correct evaluation of the situation .Physics Force & Laws Of Motion Level: High School
A typical GPS satellite orbits at an altitude of 2.00x 10^7m . Find the orbital period , orbital speed , and the acceleration due to gravity at that altitude .
Physics Force & Laws Of Motion Level: High School
I was dragging a 45.0 kg box down the driveway and out to the curb for garbage pick-up on Tuesday evening . I was able to pull it on a horizontal surface at a constant velocity . I noticed that I exerted a force of magnitude of 145N directed at an angle of 20.0(DEG) above the horizontal . Determine the coefficient of kinetic friction between the box and the driveway .
Physics Force & Laws Of Motion Level: High School
If you weigh yourself at the equator you get a smaller value than if you weigh yourself at one of the poles . Explain why ? . (earth rotates so you are moving in a circular path at the equator )
Physics Force & Laws Of Motion Level: High School
Consider a .0750 kg airplane tied to the ceiling with a string . When the airplane's motor is started the plane moves in a horizontal circle radius . 400 m with a constant speed of 1.21m/s . Find the angle the string makes with the vertical and the tension in the string .
Physics Force & Laws Of Motion Level: High School
Imagine that there is a forward who sits in front of the goal crease . The goalie (mass = 77.5 kg ) pushes the forward (mass = 97.2 kg ) away . If the acceleration of the forward is 0.847m/s^2 , find the magnitude of the acceleration of goalie . Explain your reasoning .
Physics Work,Power & Energy Level: High School
A 1.4 kg object moves along the X axis , subject to the potential energy shown in the figure at "click here" . If the object's speed at point B is 2.67 m/s , what are the approximate locations of its turning points ?m (lefthand turning point)
m (righthand turning point)
Physics Work,Power & Energy Level: High School
A 0.2 kg rubber ball is dropped from the window of the building . It strikes the sidewalk below at 30 m/s and rebounds at 20 m/s . Find the change in momentum of the ball as a result of the collision with the side walk ( in kg m/s ) .
Physics Work,Power & Energy Level: High School
The potential energy of a 0.20 kg particle moving along the X axis is given by U (x) = 8x^2-2x^4 where U is in joules and x in meters . When the particle is at x = 10m , what will be its acceleration ?
Physics Work,Power & Energy Level: High School
Assuming an efficiency of 25% for the muscle system in the process of converting food energy into mechanical work , how much energy would be used by a person of mass 75 kg . (weight 165 lb.) in the process of climbing four flights of stairs for a total height of 15 meters ? Find the answer in joules and convert to dietary calories (1 dietary calorie = 4186 joules)
Physics Work,Power & Energy Level: High School
A person pushes a 10 kg cart a distance of 20 meters by exerting a 60 newton horizontal force . The frictional resistance force is 50 newtons . How much work is done by each force acting on the cart ? How much kinetic energy does the cart have at the end of the 20 meters if it started from rest ?
Physics Work,Power & Energy Level: High School
A 2.0 kg block is thrown upward from a point 20 m above Earth's surface . At what height above Earth's surface will the gravitational potential energy of the Earth block system have increased by 500 J ?
Physics Work,Power & Energy Level: High School
As in the figure shown in "click here" a small block of mass m = 0.041 kg can slide along the frictionless loop-the-loop , with loop radius R = 15 cm . The block is released from rest at point P , at height h = 7R above the bottom of the loop . How much work does the gravitational force do on the block as the block travels from point P toa) point Q and
b) the top of the loop? If the gravitational potential energy of the block-Earth system is taken to be zero at the bottom of the loop , what is that potential energy when the block is
c) at point P,
d) at point Q, and
e) at the top of the loop ?
