A ball thrown upwards reaches a maximum height and then comes back down to the original level. At the peak of the motion the velocity and acceleration are both zero
Indicate whether the statement is true or false
F
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When galaxies collide, the large-scale galactic structure is affected, but most of the individual stars are not
Indicate whether the statement is true or false
Consider the following statement, and explain whether or not it is sensible: If you had a very fast spaceship, you could travel to the celestial sphere in about 100 years
What will be an ideal response?
Which of the following statements describes a true observation that represents strong physical evidence that magnetic poles are not the same as electric charges? Select all answers that are both physically true and represent relevant evidence. (To select multiple answers using the back of the book, point to answers with multiple fingers.)
A. We describe magnetic poles as being north and south but charges as being positive or negative. B. A magnet does not exert force on a motionless charged particle, but another charged particle will. C. A magnet exerts force in a different direction on a motionless charged particle than a charged particle does. D. Magnetic fields are measured in teslas, but electric fields are measured in N/C. E. No one has seen an isolated magnetic pole. F. What do you mean? At the deepest level, electric charges and magnetic poles really are the same thing!
A 20.0 kg box slides down a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 50.0 N is applied to the box in the upward direction to try to pull it up the incline. The applied force makes an angle of 10.0 degrees to the incline. If the incline has a coefficient of kinetic friction of 0.00, then the increase in the kinetic energy of the box is
A. 420 J. B. 475 J. C. 521 J. D. 585 J. E. 620 J.