A particle moving with a constant acceleration has a velocity of 20 cm/s when its position is x = 10 cm. Its position 7.0 s later is x = ?30 cm. What is the acceleration of the particle?
a. ?7.3 cm/s2
b. ?8.9 cm/s2
c. ?11 cm/s2
d. ?15 cm/s2
e. ?13 cm/s2
a
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A narrow slit is illuminated with sodium yellow light of wavelength 589 nm. If the central maximum extends to ±30.0°, how wide is the slit?
A. 0.500 mm B. 2.20 × 10?6 m C. 3.33 × 10?5 m D. 1.18 ?m E. 5.89 ?m
A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball initially at rest. After the putty sticks to the ball, both move with a combined momentum of
A) less than 1 unit. B) more than 1 unit. C) 1 unit. D) not enough information
In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each flight rises 3.1 m
(1 hp = 746 W) (a) What is her total change in potential energy? (b) What was the minimum average power (in watts) that she expended during the 22 s? (c) What horsepower motor would be required to generate the same power?
A very delicate sample is placed 0.150 cm from the objective lens of a microscope. The focal length of the objective is 0.140 cm,
and that of the eyepiece is 1.0 cm. The near-point distance of the person using the microscope is 25.0 cm. The magnitude of the final magnification of the microscope is closes to A) 375. B) 300. C) 250. D) 125. E) 100.