The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?
a. 16 s
b. 21 s
c. 24 s
d. 14 s
e. 19 s
A
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A refrigerator weighing 1500 N is to be lifted onto a truck bed that is 1.0 m above the ground. When pushed up a slanting ramp 2.0 m in length a force of only 750 N is required to move it at constant velocity. Neglecting friction and comparing the work involved in lifting the refrigerator straight up to the work in pushing it along the ramp, there is
A. an equal amount of work is required in each case. B. less work required when the ramp is employed. C. more work required when the ramp is employed.
A parallel-plate capacitor has plates of area 0.20 m2 separated by a distance of 1.0 mm. What is the strength of the electric field between these plates when this capacitor is connected to a 6.0 V battery?
A) 3.0 kN/C B) 1.2 kN/C C) 6.0 N/mC D) 12. N/C E) 6.0 N/C
On bare feet, a tile floor feels colder than a rug because the tile has a greater ______________
Fill in the blank(s) with correct word
Short-focal-length lenses and mirrors must be strongly curved
a. True b. False Indicate whether the statement is true or false