A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest. If the football has a mass of 0.45 kg and time of contact with the football is 0.035 s, what is the force exerted on the foot?
a. 14 N
b. 13 N
c. 390 N
d. 860 N
e. 900 N
c
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If the displacement of an object, x, is related to velocity, v, according to the relation x = Av, the constant, A, has the dimension of which of the following?
a. acceleration b. length c. time d. area
Calculate the force on a string tied to a ceiling with a 9.0-kg mass attached
You are looking for a new electrical appliance that will last a long time. You are considering buying a high-efficiency model that uses an average of 60 W
of power and costs $800 or a lower efficiency model that uses an average of 90 W and costs $600 . If the cost of electricity is $0.10/kWh and the appliances are operated continuously, how much money will you have saved by purchasing and operating the high efficiency model over the low efficiency model after 15 years?
A slit of width 0.010 mm has light of frequency 5.0 × 1014 Hz passing through it onto a screen 60 cm away. How wide is the central maximum? (c = 3.00 × 108 m/s)
A) 1.8 cm B) 0.12 cm C) 3.6 cm D) 7.2 cm E) 0.90 cm