Problem 1CQ: Are the objects described here in equilibrium while at rest, in equilibrium while in motion, or not... Problem 2CQ: A ball tosses straight up has v = 0 at its highest point. Is it in equilibrium? Explain. Problem 3CQ: Kat, Matt, and Nat are arguing about why a physics book on a table doesn’t fall. According to Kat,... Problem 4CQ: If you know all of the forces acting on a moving object, can you tell the direction the object is... Problem 5CQ: An elevator, hanging from a single cable, moves upward at constant speed. Friction and air... Problem 6CQ: An elevator, hanging from a single cable, moves downward and is slowing. Friction and air resistance... Problem 7CQ: Are the following statements true or false? Explain. a. The mass of an object depends on its... Problem 8CQ:
8. An astronaut takes his bathroom scale to the moon and then stands on it. Is the reading of the... Problem 9CQ:
9. The four balls in FIGURE Q6.9 have been thrown straight up. They have the same size, but... Problem 10CQ Problem 11CQ Problem 12CQ: A hand presses down on the book in FIGURE Q6.12. Is the normal force of the table on the book larger... Problem 13CQ: Boxes A and B in FIGURES Q6.13 both remain at rest. Is the friction force on A larger than, smaller... Problem 14CQ: Suppose you push a hockey puck of mass m across frictionless ice for 1.0 s, starting from rest,... Problem 15CQ: A block pushed along the floor with velocity voxslides a distance d after the pushing force is... Problem 16CQ: A crate of fragile dishes is in the back of a pickup truck. The truck accelerates north from a stop... Problem 17CQ: Five balls move through the air as shown in FIGURE Q6.17. All five have the same size and shape. Air... Problem 1EAP: The three ropes in FIGURE EX6.1 are tied to a small, very light ring. Two of these ropes are... Problem 2EAP: The three ropes in FIGURE EX6.2 are tied to a small, very light ring. Two of the ropes are anchored... Problem 3EAP: A football coach sits on a sled while two of his players build their strength by dragging the sled... Problem 4EAP: A 20 kg loudspeaker is suspended 2.0 m below the ceiling by two 3.0-m-long cables that angle outward... Problem 5EAP: A 65 kg gymnast wedges himself between two closely spaced vertical walls by pressing his hands and... Problem 6EAP: A construction worker with a weight of 850 N stands on a roof that is sloped at 20°. What is the... Problem 7EAP: In an electricity experiment, a 1.0 g plastic ball is suspended on a 60-cm-long string and given an... Problem 8EAP: The forces in FIGURE EX6.8 act on a 2.0 kg object. What are the value of axand ay, the x- and... Problem 9EAP: The forces in FIGURE EX6.9 act on a 2.0 kg object. What are the values of axand ay, the x- and... Problem 10EAP: FIGURE EX6.10 shows the velocity graph of a 2.0 kg object as it moves along the x-axis. What is the... Problem 11EAP: FIGURE EX6.11 shows the force acting on a 2.0 kg object as it moves along the x-axis. The object is... Problem 12EAP: A horizontal rope is tied to a 50 kg box on frictionless ice. What is the tension in the rope if:... Problem 13EAP: A 50 kg box hangs from a rope. What is the tension in the rope if: a. The box is at rest? b. The box... Problem 14EAP: A 2.0 × 107 kg train applies its brakes with the intent of slowing down at a 1.2 m/s2 rate. What... Problem 15EAP: A 8.0 × 104 kg spaceship is at rest in deep space. Its thrusters provide a force of 1200 kN. The... Problem 16EAP: The position of a 2.0 kg mass is given by x = (2t3 3t2) m, where t is in seconds. What is the net... Problem 17EAP: A woman has mass of 55 kg. a. What is her weight while standing on earth? b. What are her mass and... Problem 18EAP: It takes the elevator in a skyscraper 4.0 s to reach its cruising speed of 10 m/s. A 60 kg passenger... Problem 19EAP: Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes, 3.0 s to... Problem 20EAP: What thrust does a 200 g model rocket need in order to have a vertical acceleration of 10 m/s2 a. On... Problem 21EAP: What thrust does a 200 g model rocket need in order to have a vertical acceleration of 10 m/s2 a. On... Problem 22EAP: A 20,000 kg rocket has a rocket motor that generates 3.0 × 105 N of thrust. Assume no air... Problem 23EAP: The earth is 1.50 × 1011 m from the sun. The earth’s mass is 5.98 × 1024 kg, while the mass of the... Problem 24EAP: Bonnie and Clyde are sliding a 300 kg bank safe across the floor to their getaway car. The safe... Problem 25EAP: A stubborn, 120 kg mule sits down and refuses to move. To drag the mule to the barn, the exasperated... Problem 26EAP: A 10 kg crate is placed on a horizontal conveyor belt. The materials are such that s=0.5 and k=0.3 .... Problem 27EAP: Bob is pulling a 30 kg filing cabinet with a force of 200 N, but the filing cabinet refuses to move.... Problem 28EAP: A rubber-wheeled kg cart rolls down a 15° concrete incline. What is the cart’s acceleration if... Problem 29EAP: A 4000 kg truck is parked on a 15° slope. How big is the friction force on the truck? The... Problem 30EAP: A 1500 kg car skids to a halt on a wet road where k=0.50 . How fast was the car traveling if it... Problem 31EAP: A 50,000 kg locomotive is traveling at 10 m/s when its engine and brakes both fail. How far will the... Problem 32EAP: You and your friend Peter are putting new shingles on a roof pitched at 25°. You’re sitting on the... Problem 33EAP: An Airbus A320 jetliner has a takeoff mass of 75,000 kg. It reaches its takeoff speed of 82 m/s (180... Problem 34EAP:
34. A medium-sized jet has a 3.8-m-diameter fuselage and a loaded mass of 85,000 kg. The drag on... Problem 35EAP: A 75 kg skydiver can be modeled as a rectangular “box” with dimension 20 cm × 40 cm × 180 cm. What... Problem 36EAP: A 6.5-cm-diameter ball has a terminal speed of 26 m/s. What is the ball’s mass? Problem 37EAP: A 2.0 kg object initially at rest at the origin is subjected to the time-varying force shown in... Problem 38EAP: A 5.0 kg object initially at rest at the origin is subjected to the time-varying force shown in... Problem 39EAP: The 1000 kg steel beam in FIGURE P6.39 is supported by two ropes. What is the tension in each?... Problem 40EAP: Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. The scale reads 830 N for the... Problem 41EAP: An accident victim with a broken leg is being placed in traction. The patient wears a special boot... Problem 42EAP: Seat belts and air bags save lives by reducing the forces exerted on the driver and passenger in an... Problem 43EAP: The piston of a machine exerts a constant force on a ball as it move horizontally through a distance... Problem 44EAP: Compressed air is used to fire a 50 g ball vertically upward from a 1.0-m-tall tube. The air exerts... Problem 45EAP: a. A rocket of mass m is launched straight up with thrust thrust. Find an expression for the... Problem 46EAP: A rifle with a barrel length of 60 cm fires a 10 g bullet with a horizontal speed of 400 m/s. The... Problem 47EAP: A truck with a heavy load has a total mass of 7500 kg. It is climbing a 15° incline at a steady 15... Problem 48EAP: An object of mass m is at rest at the top of a smooth slope of height h and length L. The... Problem 49EAP Problem 50EAP: A baggage handler drops your 10 kg suitcase onto a conveyor belt running at 2.0 m/s. The materials... Problem 51EAP: A 2.0 kg wood block is launched up a wooden ramp that is inclined at a 30° angle. The block's... Problem 52EAP: It’s a snowy day and you're pulling a friend along a level road on a sled. You've both been taking... Problem 53EAP: A large box of mass M is pulled across a horizontal, frictionless surface by a horizontal rope with... Problem 54EAP Problem 55EAP: You're driving along at 25 m/s with your aunt's valuable antiques in the back of your pickup truck... Problem 56EAP: The 2.0 kg wood box in FIGURE P6.56 slides down a vertical wood wall while you push on it at a 45°... Problem 57EAP: A 1.0 kg wood block is pressed against a vertical wood wall by the 12 N force shown in FIGURE P6.57.... Problem 58EAP: A person with compromised pinch strength in his fingers can exert a force of only 6.0 N to either... Problem 59EAP: A ball is shot from a compressed-air gun at twice its terminal speed. a. What is the ball's initial... Problem 60EAP: Starting from rest, a 2500 kg helicopter accelerates straight up at a constant 2.0 m/s2. What is the... Problem 61EAP: Astronauts in space "weigh" themselves by oscillating on a spring. Suppose the position of an... Problem 62EAP: A particle of mass m moving along the x-axis experiences the net force Fx= ct, where c is a... Problem 63EAP: At t = 0, an object of mass m is at rest at x = 0 on a horizontal, frictionless surface. A... Problem 64EAP: At t = 0, an object of mass m is at rest at x = 0 on a horizontal, frictionless surface. Starting at... Problem 65EAP Problem 66EAP: A 60 kg skater is gliding across frictionless ice at 4.0 m/s. Air resistance is not negligible. You... Problem 67EAP Problem 68EAP: Problems 68 and 69 show a free-body diagram. For each: a. Write a realistic dynamics problem for... Problem 69EAP: Problems 68 and 69 show a free-body diagram. For each: a. Write a realistic dynamics problem for... Problem 70EAP Problem 71EAP: In Problems 70 through 72 you are given the dynamics equations that are used to solve a problem. For... Problem 72EAP: In Problems 70 through 72 you are given the dynamics equations that are used to solve a problem. For... Problem 73EAP: A block of mass m is at rest at the origin at t = 0. It is pushed with constant force F0from x = 0... Problem 74EAP: A spring-loaded toy gun exerts a variable force on a plastic ball as the spring expands. Consider a... Problem 75EAP: FIGURE CP6.7S shows an accelerometer, a device for measuring the horizontal acceleration of cars and... Problem 76EAP: An object moving in a liquid experiences a linear drag force: Fdrag = (bv, direction opposite the... Problem 77EAP Problem 78EAP: An object with cross section A is shot horizontally across frictionless ice. Its initial velocity is... format_list_bulleted