Questions from College Physics

Q: The intensity of the Sun's radiation that reaches Earth's atmosphere is 1

The intensity of the Sun's radiation that reaches Earth's atmosphere is 1.4 kW/m2 (kW = kilowatt; W = watt). Convert this to W/cm2.

Q: Blood flows through the aorta at an average speed of v =

Blood flows through the aorta at an average speed of v = 18 cm/s. The aorta is roughly cylindrical with a radius r = 12 mm. The volume rate of blood flow through the aorta is π r2v. Calculate the volu...

Q: A molecule in air is moving at a speed of 459 m

A molecule in air is moving at a speed of 459 m/s. How far would the molecule move during 7.00 ms (milliseconds) if it didn't collide with any other molecules?

Q: Express this product in units of km3 with the appropriate number

Express this product in units of km3 with the appropriate number of significant figures:

Q: (a) How many square centimeters are in 1 square foot

(a) How many square centimeters are in 1 square foot? (1 in = 2.54 cm.) (b) How many square centimeters are in 1 square meter?

Q: A snail crawls at a pace of 5.0 cm/

A snail crawls at a pace of 5.0 cm/min. Express the snail's speed in (a) ft./s and (b) mi/h.

Q: The quantity of energy Q transferred by heat conduction through an insulating

The quantity of energy Q transferred by heat conduction through an insulating pad in time interval Δt is described by Q/Δt = κA ΔT/d, where κ is the thermal conductivity of the material, A is the face...

Q: An average-sized capillary in the human body has a cross

An average-sized capillary in the human body has a cross-sectional area of about 150 µm2. What is this area in square millimeters (mm2)?

Q: An equation for potential energy states U = mgy. If U

An equation for potential energy states U = mgy. If U is in joules (J), with m in kg, y in m, and g in m/s2, find the combination of SI base units that is equivalent to joules.

Q: One equation involving force states that Fnet = ma, where Fnet

One equation involving force states that Fnet = ma, where Fnet is in newtons (N), m is in kg, and a is in m·s−2. Another equation states that F = −kx, where F is in newtons, k is in kg·s−2, and x is i...