A baseball thrown from the outfield is released from shoulder height at an initial velocity of 39.2 m/s at an initial angle of 30.0° with respect to the horizontal. If it is in its trajectory for a total of 4.00 s before being caught by the third baseman at an equal shoulder-height level, what is the ball's net vertical displacement during its 4.00-s trajectory?
a. 11.0 m
c. 22.1 m
b. 9.80 m
d. zero
D
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A singly charged 9Be ion is accelerated from rest through a potential difference of 8000 V. The ion is then sent into a mass spectrometer where the radius of the path is 29 cm. What is the magnetic field in the spectrometer?
A. 0.27 T B. 0.13 T C. 0.067 T D. 0.0028 T E. 0.00019 T
The redshifts of Galaxy A and Galaxy B have been measured. The redshift of Galaxy B is twice that of Galaxy A. Which is moving away faster?
A. Galaxy A B. The two galaxies may be moving away at the same speed since their recessional velocity depends upon their distance. C. Galaxy B
All directions are south from the North Pole
Indicate whether the statement is true or false
You push your physics book across a table. The book weighs 8 N, you push with a steady 5 N force, and the force of friction against the book is 3 N. You push the book a distance of 2 m. The amount of work you do on the book is
A) zero. B) 6 J. C) 16 J. D) 10 J. E) impossible to tell without more information.