Learning Materials
Features
Discover
Chapter 7: Q66P (page 175)
If a car of mass 1200kg is moving along a highway at 120 km/h, what is the car鈥檚 kinetic energy as determined by someone standing alongside the highway?
The car鈥檚 kinetic energy (K.E) as determined by someone standing alongside the highway is
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
A 2.0 kglunchbox is sent sliding over a frictionless surface, in the positive direction of an xaxis along the surface. Beginning at time t=0, a steady wind pushes on the lunchbox in the negative direction of the xaxis. Figure 7-51shows the position xof the lunchbox as a function of time tas the wind pushes on the lunchbox. From the graph, estimate the kinetic energy of the lunchbox at (a) t=1.0 sand (b)t=5.0 s. (c) How much work does the force from the wind do on the lunchbox fromt=1.0 s to t=5.0 s?
A glob of slime is launched or dropped from the edge of a cliff. Which of the graphs in figure 7-22 could possibly show how the kinetic energy of the glob changes during its flight?
A 4.00 kg block is pulled up a frictionless inclined plane by a 50.0 N force that is parallel to the plane, starting from rest. The normal force on the block from the plane has magnitude 13.41 N. What is the block鈥檚 speed when its displacement up the ramp is 3.00 m?
A 12.0 Nforce with a fixed orientation does work on a particle as the particle moves through the three-dimensional displacement . What is the angle between the force and the displacement if the change in the particle鈥檚 kinetic energy is (a) +30.0 J and (b) -30.0 J ?
In Fig. , a horizontal force of magnitude is applied to a psychology book as the book slides a distanceup a frictionless ramp at angle . (a) During the displacement, what is the net work done on the book by , the gravitational force on the book, and the normal force on the book? (b) If the book has zero kinetic energy at the start of the displacement, what is its speed at the end of the displacement?
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine