What is the change in internal energy if 60 J of heat are released from a system and 20 J of work is done on the system Use U = Q - W.

A. - 40 J

B. 40 J

C. - 80 J

D. 80 J

After fixing a flat tire on a bicycle you give the wheel a spin. (a) if its initial angular speed was 6.35 rad/s and it rotated 14.

1. The upward force exerted on an object falling through air is _ a. terminal velocity c. air resistance b. momentum d. weightless

Consider the electrostatic force between two particles of equal mass m = 32 * 10^-26 kg and carrying different charges q1 = 17e and q2 = 28e, where e denotes the magnitude of the charge on an electron.

Which volcanic hazard can block the sunlight and temporarily cool the Earth's surface?

Earth has retained a lot of internal heat primarily because of its (a) distance from the Sun; (b) large iron core; (c) relatively large size.

Earth's tallest mountain ranges are found at plate boundaries

Is a lung a living organism, why or why not?

A wire carries a steady current of 2.20 A. A straight section of the wire is 0.750 m long and lies along the y axis within a uniform magnetic field, vector B = 1.70 k T.

A 5.00-kg howler monkey is swinging due east on a vine. It overtakes and grabs onto a 6.00-kg monkey also moving east on a second vine. The first monkey is moving at 10.0 m/s at the instant it grabs the second, which is moving at 7.00 m/s.

One of the heating systems we talked about in this course comprises of a system of ducts. What is the process by which heat is transferred in this system? a. Conduction b. Convection c. Radiation d. None of the above