A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
A) 75 N
B) 61 N
C) 85 N
D) 92 N
Answer: A
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Europa is located outside the Sun's habitable zone and yet may be habitable. How can this be?
A) Europa's subsurface ocean contains lots of minerals that allow water to remain liquid at much lower temperatures B) Europa is continually being hit by comets and asteroids which keeps water beneath its surface liquid C) Europa is tidally heated, allowing liquid water to exist beneath its icy surface D) Europa is large enough to have appreciable heat trapped inside it to keep water beneath the surface liquid
The latent heat of vaporization of sweat is 2 430 kJ/kg at body temperature. Assuming that sweating is the only mechanism for dissipating heat, what would be the maximum sustainable metabolic rate if 75% of the energy used by the body goes into waste heat? The body can produce up to 1.5 kg of sweat per hour
a. 4.9E+4 W b. 4.9E+6 W c. 2.2E+4 W d. 1.4E+3 W
The current in a long wire creates a magnetic field in the region around the wire. How is the strength of the field at distance r from the wire center related to the magnitude of the field?
a. field directly proportional to r b. field inversely proportional to r c. field directly proportional to r2 d. field inversely proportional to r2
A 0.20-kg mass is oscillating on a spring over a horizontal, frictionless surface. When it is at a displacement of 2.6 cm from equilibrium, it has a kinetic energy of 2.7 J and a spring potential energy of 2.2 J. What is the maximum speed of the mass during its oscillation?
a. 3.7 m/s c. 6.0 m/s b. 4.7 m/s d. 7.0 m/s