A pinhole camera is used to photograph a 23-cm tall object at a distance of 3.0 m, the image being projected on film at a distance of 46 cm from the pinhole. What are the height and orientation of the image?
a. 3.5 cm, upright
c. 12 cm, upright
b. 3.5 cm, inverted
d. 12 cm, inverted
B
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Observational evidence tells you that as a nova explosion begins, _____
A) a cloud of debris ejects into space B) matter settles inward onto the surface of a white dwarf and forms a layer of unused nuclear fuel C) dense gas comes toward you at a few thousand kilometers per second D) the spectral lines change to emission lines
An airplane is flying at a speed of 200 m/s in level flight at an altitude of 800 m. A package is to be dropped from the airplane to land on a target on the ground. In what direction will the package be traveling when it hits the ground?
A) 49.3° below horizontal B) 62.7° below horizontal C) 54.8° below horizontal D) 84.2° below horizontal E) 32.1° below horizontal
Sgr A* is believed to be the center of the Milky Way galaxy because I. It lies in the general direction of the center of the galaxy based on observations of globular clusters in the plane of the Milky Way. II. Long wavelength dust penetrating images show it to be a region crowded with stars III. Orbits of stars around it indicate a mass several million times that of the Sun within a volume a few
light hours in size IV. Radio observations show it is a concentrated source at the center of swirling clouds of gas a. I & II only b. II & III only c. I & IV only d. II & IV only e. All of I, II, III, & IV
A mass src="https://sciemce.com/media/4/bf4b81cac39c602934.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless horizontal surface as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If 
is 1.00 kg, 
is 2.00 kg, and M is 4.00 kg, then what is the acceleration of
A. 1.55 
B. 1.96
C. 2.06
D. 2.33
E. 2.72