![]() ![]() An 8.0 N wooden block slides across a horizontal wooden floor at constant velocity. If the frictional force on the crate has a magnitude of 10. newtons is applied to a 20.-kilogram crate moving toward the east on a level floor. A 1500 kg car at rest in a parking lot 20. A constant eastward horizontal force of 70. ![]() A 490 kg elephant waling with a speed of 1.0 m/s d. A 30 kg child traveling at 10 m/s on her bike c. 90° Which object has the greatest inertia? a. At what angle above the horizontal should the ball be thrown to reach the greatest height? a. A ball is thrown with an initial speed of 10 m/s. What is the mass of the astronaut at the surface of the Moon, where the acceleration due to gravity is 1.62 m/s? a. A 65.0 kg astronaut weighs 638 N at the surface of Earth. If the frictional force on the crate has a magnitude of 10 N, what is the magnitude of the crate's acceleration? a. A constant eastward horizontal force of 70 N is applied to a 20 kg crate moving towards the east on a level floor. The vertical component of the ball's velocity 16. The horizontal component of the ball's velocity d. Which quantity has a magnitude of zero when the ball is at the highest point of its trajectory? a. A ball is thrown with a velocity of 35 m/s at an angle of 30° above the horizontal. The magnitude of the net force acting on the object is a. An object weighing 2.0 N is pushed across a horizontal, frictionless surface by a horizontal force of 4.0 N. The task is made clearer by beginning with a diagram of the situation with a labeled angle and a labeled hypotenuse. To determine the magnitudes of these two components, the sine and cosine function will have to be used. Increasing the initial horizontal velocity to 2x d. The force applied to the car has both a vertical (southward) and a horizontal component (eastward). Which change would have resulted in a greater time of flight for the projectile? a. A projectile of mass m is fired with initial horizontal velocity Vy from height h above level ground. What is the magnitude of the ball's acceleration 0.200 s after it leaves the tabletop? a. The ball lands on the floor 0.391 s after leaving the tabletop. A ball is rolling horizontally at 3 m/s as it leaves the edge of a tabletop 0.75 m above the floor. Both velocity and acceleration are not zero.ġ2. Velocity is nonzero and acceleration is zero. Velocity is zero and acceleration is nonzero. Which statement best describes the ball's velocity and acceleration at the top of its flight? a. A ball is thrown straight upward from the surface of Earth. ![]() What are the components of the projectile's velocity after 2.0 s of flight? (Neglect friction.] a. The vertical component of the projectile's velocity, Vy is initially 30 m/s. ![]() The horizontal component of the projectile's velocity, Vx is initially 40 m/s. 0.0 m/s2 A projectile is launched at an angle above the ground. 2017.06 43 A constant eastward horizontal force of 70. What is the acceleration of the golf ball at the highest point in its trajectory? a. A golf ball is hit at an angle of 45° above the horizontal. The difference between the two forces is the work done on the block by the person, which can be calculated as the force of the block times the distance through which it moves, or 3 N × 2 m = 6 J.Transcribed image text: 9. The force of the block on the person is also 3 N. In the example above, the force of the person pushing the block is 3 N. By Newton's third law, the force of the reaction is equal and opposite to the force of the action, so the point where the force is applied does work on the person applying the force. Work is due to a force acting on a point that is stationary-that is, a point where the force is applied does not move. Work is a scalar quantity, meaning that it can be described by a single number-for example, if a force of 3 newtons acts through a distance of 2 meters, then the work done is 6 joules. For example, if a force of 10 newtons (N) acts through a distance of 2 meters (m), then doing 10 joules (J) of work on that object requires exerting a force of 10 N for 2 m. The "work" of a force F on an object that it pushes is defined as the product of the force and the distance through which it moves the object. In physics, work is the transfer of energy by a force acting through a distance. ![]()
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