College Physics, Volume 1
2nd Edition
ISBN: 9781133710271
Author: Giordano
Publisher: Cengage
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please please show all work step by step and do each part of the question.
You apply a constant force F (in units of N) = -50.0 i + 20.0j to a 20.0 kg box as the box travels in a straight line (along the floor) for 6.00 m in a direction that is 30 degrees CCW of +x.
a) Graph the force and displacement vectors (use a straight edge) and explain how you can tell from the graph whether the work done is positive, negative or zero.
b) How much work does the applied force F do on the box? (J)
You are sitting in the back seat of a taxi. The taxi driver makes a very sharp turn to the left, but maintains a constant speed.
Because you did not wear the seat belt, you slide to the right and press against the door. Which of the following forces acts
on you as you are pressed against the door?
H
H2
right
left
so op
2 W=F
W = mas
since mass
Work also da
Work Done by
O centripetal force to the right
so False it is
O centripetal force to the left
O friction force to the right
O friction force to the left
3. due to the law of
O There was no force.
one form of energy da
so But not non mehani
2 Type here to search
Bb
The earth moving around the sun in a circular orbit is acted upon by a force and hence work must be done on the earth by the force.
a) True
b) False
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- A particle of mass m moves in the XY-plane, and its position vector is given by = a cos wtî + b sin wtĵ where a, b, and w are positive constants, and a > b. Show that a. The particle moves in an ellipse. b. The force acting on the particle is always directed toward the origin. c. The total work done by the force in moving the particle once around the ellipse is zero d. The force is conservative.arrow_forwardIt is common practice in driving to ease one's foot from the gas pedal when driving downhill. Which of the following statements is correct regarding the underlying physical principle that explains why this method of coasting is practical? Question 7 options: The kinetic energy of the car is converted to gravitational potential energy as the car moves down the hill. The wheels are allowed to rotate freely while coasting so braking is more effective. The wheels are allowed to rotate freely while coasting so less friction is encountered. The gravitational potential energy of the car is converted into kinetic energy as the car moves down the hill.arrow_forwardA 2 kg ball rolls off a 26 m high cliff, and lands 28 m from the base of the cliff. Express the displacement and the gravitational force in terms of vectors and calculate the work done by the gravitational force. Note that the gravitational force is , where g is a positive number (+9.8 N/kg). (Let the origin be at the base of the cliff, with the +x direction towards where the ball lands, and the +y direction taken to be upwards.) Displacement 7 = Gravitational Force F= Work W = Additional Materials. Narrow_forward
- A 3 kg ball rolls off a 30 m high cliff, and lands 27 m from the base of the cliff. Express the displacement and the gravitational force in terms of vectors and calculate the work done by the gravitational force. Note that the gravitational force is , where g is a positive number (+9.8 N/kg). (Let the origin be at the base of the cliff, with the +x direction towards where the ball lands, and the +y direction taken to be upwards.) Displacement Gravitational Force F = N Work W =arrow_forwardA 5 kg ball rolls off a 25 m high cliff, and lands 23 m from the base of the cliff. Express the displacement and the gravitational force in terms of vectors and calculate the work done by the gravitational force. Note that the gravitational force is , where g is a positive number (+9.8 N/kg). (Let the origin be at the base of the cliff, with the +x direction towards where the ball lands, and the +y direction taken to be upwards.) Displacement F = %3D m Gravitational Force F= Work W = J Additional Materialsarrow_forwardQ19 The concept of escape velocity can be best described as: (A) The initial speed required so that an object will safely orbit the Earth. (B) The speed for an object to be launcned and fly through space forever. (C) The speed necessary for a spacecraft to escape Earth's atmosphere. (D) The velocity needed to provide an initial kinetic energy such that total mechanical energy is zero.arrow_forward
- The Ingenuity helicopter could fly horizontally with a maximum kinetic energy of 90.0J when tested on the Earth. Assume that it flies with the same maximum velocity on Mars, where Mars' gravity is 38% that of the Earth. What would its maximum kinetic energy be on Mars? O 90.0 J O 14% of 90.0 J O 38% of 90.0J O 1/6 of 90.0J O 62% of 90.0 Jarrow_forwardSteve has done a work of 3270 Joules on the stalled car as he pushes it a distance of 18m. The car also has a flat tire, so to make the car track straight, Steve must push at an angle of 30° to the direction of motion. How much force did Steve exert?arrow_forwardA gas-powered model airplane has a mass of 2.50 kilograms. A student exerts a force on a cord to keep the airplane flying around her at a constant speed of 18.0 meters per second in a horizontal, circular path with a radius of 25.0 meters. Calculate the magnitude of the centripetal force exerted on the airplane to keep it moving in this circular path. Calculate the kinetic energy of the moving airplane.arrow_forward
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Mechanical work done (GCSE Physics); Author: Dr de Bruin's Classroom;https://www.youtube.com/watch?v=OapgRhYDMvw;License: Standard YouTube License, CC-BY