During the summer months, the Gulf of Mexico is generally
A) cool along the coast.
B) very hot and very humid.
C) hot and dry.
D) none of the above
Answer: B
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Friction: A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box?
A. 32 N B. 200 N C. 220 N D. 250 N E. 620 N
The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire?
A) 0.20 A B) 0.40 A C) 0.80 A D) 3.2 A E) 1.6 A
A crystal diffracts a beam of electrons, like a grating, as they hit it perpendicular to its surface
The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface. (e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s) (a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons if they started from rest?
When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants
a. 0.250 b. 0.500 c. 0.693 d. 1.00 e. 1.44