About how hot is the core of Earth?
A. 15 million K
B. 6,500 K
C. 300 K
D. 15,000 K
Answer: B
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Gravitational Potential Energy: Three masses are located as follows: a 3.5-kg mass is at the origin, a 4.2-kg mass at (0.0 m, 7.0 m), and a 6.5-kg mass at (24.0 m, 0.0 m). What is the gravitational potential energy of this system of masses? (G = 6.67 × 10-11 N ? m2/kg2)
A. -2.8 × 10-10 J B. -2.0 × 10-10 J C. -1.4 × 10-10 J D. -3.2 × 10-10 J E. -3.9 × 10-10 J
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters away from the Sun. D) Earth is the size of a golf ball about 15 meters away from the Sun. E) Earth is the size of a marble about 25 miles away from the Sun.
A 500-turn circular loop 15.0 cm in diameter is initially aligned so that its axis is parallel to the Earth's magnetic field. In 2.77 ms the coil is flipped so that its axis is perpendicular to the Earth's field. If a voltage of 0.166 V is induced in the coil, what is the value of the Earth's magnetic field?
What will be an ideal response?
One kilogram of chilled water at 32°F (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed to operate the compressor to cool this water to 0°F if the room temperature is maintained at 75°F (24°C)? (LF,ice = 3.33 × 105 J/kg; cice = 2.09 × 103 J/kg?°C)
A. 13 B. 1.5 C. 15 D. 16 E. 33