A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at an angle of 40.0° above horizontal
The rock is thrown from a height of 2.00 m above the ground with a speed of 30.0 m/s and experiences no appreciable air resistance. If the rock strikes the window on its upward trajectory, from what horizontal distance from the window was it released?
A) 53.2 m
B) 48.7 m
C) 71.6 m
D) 29.8 m
E) 27.3 m
E
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A metal rod of length L in a region of space where a constant magnetic field points into the page rotates clockwise about an axis through its center at constant angular velocity ?. While it rotates, the point(s) at lowest potential is(are)
a.
A.
b.
B.
c.
C.
d.
D.
e.
A and E.
A pendulum when on Earth has a period of 1.00 s. When transported to the moon, where the gravitational acceleration is 1/6 that on Earth, the period of the pendulum would be:
A. 4.1 s B. 1.00 s C. 2.4 s D. 4.1 s
Water in a tightly closed flask evaporates at a rate of 0.00038 lbm/hr. Estimate the specific humidity of the air 1 inch above the liquid water-air surface if the dry bulb temperature is 70ºF. The water-air surface is 3 in^2.
What will be an ideal response?
Suppose Bohr had chosen the potential energy of the electron in the hydrogen atom to be V = 0 when the electron is in the orbit with n = 1 . He could do this by
a. choosing n = 1 for the orbit where the kinetic energy of the electron is zero. b. adding a constant 13.6 eV to the potential energy for all values of n. c. adding a constant 27.2 eV to the potential energy for all values of n. d. subtracting a constant 13.6 eV from the potential energy for all values of n. e. subtracting a constant 27.2 eV from the potential energy for all values of n.