A wire is carrying current vertically downward. What is the direction of the force due to Earth's magnetic field on the wire?
A)
horizontally towards the north
B)
horizontally towards the south
C)
horizontally towards the east
D)
horizontally towards the west
E)
vertically upward
C
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If an element has 15 protons and 16 neutrons and 15 electrons, what is the mass number of the element?
A) 31 B) 15 C) 16 D) 30 E) none of the above
Where is it high tide?
A) point 1 only B) point 2 only C) points 1 and 3 D) points 2 and 4
If the force of gravity exerted on the Sun by Earth is the same as the force exerted by Earth on the Sun, why does Earth orbit the Sun, and not the other way around?
A. They each orbit around the geometric center of the system. B. Earth is less massive, and is accelerated more by the gravitational force and moves faster. C. Planets, by definition, orbit the Sun, and not the other way around. D. The combined gravitational forces of all the planets keeps the Sun at the center of the Solar System. E. None of these choices is correct.
An object weighing 44.1 N hangs from a vertical massless ideal spring. When set in vertical motion, the object obeys the equation y(t) = (6.20 cm) cos[(2.74 rad/s)t - 1.40]. (a) Find the time for this object to vibrate one complete cycle
(b) What are the maximum speed and maximum acceleration of the object? (c) What is the TOTAL distance the object moves through in one cycle? (d) Find the maximum kinetic energy of the object. (e) What is the spring constant of the spring?