Starting from rest, a 2 kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on the body is
a. 2 N
b. 4 N
c. 8 N
d. 16 N
e. 6 N
C
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The Harvard College Observatory Computers from c. 1880 into the early 20th century were:
A) the first digital computers. B) not much different than cash registers. C) functionally similar to the modern 4- function calculator. D) a group of women who made important contributions to astronomy. E) mechanically operated adding machines.
A race car travels 40 m/s around a banked (45° with the horizontal) circular (radius = 0.20 km) track. What is the magnitude of the resultant force on the 80-kg driver of this car?
a. 0.68 kN b. 0.64 kN c. 0.72 kN d. 0.76 kN e. 0.52 kN
The Moon always keeps the same side facing Earth
a. True b. False Indicate whether the statement is true or false
Briefly explain why spectral lines are useful in determining the temperature of their source
What will be an ideal response?