![]() ![]() ![]() The package falls freely.Ī) Just as it hits the ground, find the y-component of the velocity of the package relative to the helicopter.ī) Just as it hits the ground, find the yy-component of the velocity of the helicopter relative to the package.ģ. A tennis ball rolls off the edge of a tabletop 0.800 mm above the floor and strikes the floor at a point 1.20 mm horizontally from the edge of the table.ī) Find the magnitude of the initial velocity of the ball.Ĭ) Find the magnitude of the velocity of the ball just before it strikes the floor.ĭ) Find the direction of the velocity of the ball just before it strikes the floor.Ĥ. A man stands on the roof of a 12.0-mm-tall building and throws a rock with a velocity of magnitude 24.0 m/sm/s at an angle of 37.0 ? above the horizontal. We have chosen the positive direction to be upward. Astronauts on our moon must function with an acceleration due to gravity of 0.165gg.Ī) If an astronaut can throw a certain wrench 12.0 mm vertically upward on earth, how high could he throw it on our moon if he gives it the same starting speed in both places?ī) How much longer would it be in motion (going up and coming down) on the moon than on earth?Ģ. A helicopter 6.90 mm above the ground and descending at 4.50 m/sm/s drops a package from rest (relative to the helicopter). The average distance between them is 1.50 × 10 11 m. If the mass of the satellite was doubled and placed into the same orbit, what gravitational force would the satellite have acting on it?ġ8. At a certain distance from the center of Earth, a satellite experiences a gravitational force, F. Which vector best represents the frictional force?ġ7. A mass is being pushed to the right at a constant velocity. In which direction will a suitcase lying in the center of the frictionless truck bed move?ġ6. The driver of a pickup truck traveling north at 20 m/s suddenly stops. ![]() What is the magnitude of the net force on the box?ġ5. The force of static friction between the box and the floor is 230 N. A person pushes horizontally on the box with a force of 90. A 46-kg rigid box is at rest on a horizontal floor. opposite in direction but much larger than the force exerted on the bat by the softballġ4.opposite in direction but much smaller than the force exerted on the bat by the softball.equal in size but opposite in direction to the force exerted on the bat by the softball.equal in both size and direction to the force exerted on the bat by the softball.What is the force exerted on the softball by the bat? A physics student hits a softball with a bat. If he is in an elevator that is accelerating upward at 2.00 m/s/s, what will be his weight?ġ3. a smaller magnitude but the same directionġ2. ![]() a larger magnitude but the opposite direction.the same magnitude but the opposite direction.the same magnitude and the same direction.How does the force that the student exerts on the chair compare to the force the chair exerts on the student? Cart X will reach the bottom of the incline first.ġ1.Cart Y will reach the bottom first but not in half the time of cart X.Cart Y will reach the bottom of the incline in half the time of cart X.The carts will reach the bottom of the inclines at the same time.If the carts are allowed to roll down the inclines, which statement will be true? In the drawing below, the identical inclines are frictionless and the mass of cart X is twice that of cart Y. A 45-kg object is given a net force of 500 N. What is the acceleration due to gravity on planet X?ĩ. This graph shows weight versus mass for a group of objects on planet X. Which of the following relations is true?Ĩ. A 20-kg mass is suspended from two ropes, as shown in the diagram below. What is the tension needed for the cable to support the sign?ħ. A sign of uniform density weighing 315 N is supported by a rigid horizontal pipe of negligible mass and a cable that makes a 50.0° angle with the wall. What is the force the table exerts on the textbook?Ħ. A 20.0-N physics textbook rests on a table. It moves with increasing speed, then the speed gradually decreases.ĥ.Which describes its motion at the end of the 3 seconds when the engines are turned off? A spaceship in deep space fires its engines for 3 seconds. When forces acting on an object are balanced, which characteristic of motion is zero?Ĥ. time graph is shown below.ĭuring which interval is there no net force acting on the object?ģ. time graph of an object.ĭuring which intervals is the object being acted on by a force?Ģ. ![]()
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