Within a given system, the internal forces

A. are always balanced by the external forces.
B. all add to zero.
C. are only determined by subtracting the external forces from the net force on the system.
D. determine the motion of the system.
E. are measured with a gravimeter.


B. all add to zero.

Physics & Space Science

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A roentgen (R) is

A) 10-2 J/kg. B) 3.70 × 1010 decays/s in radium. C) the SI unit of radioactivity ( = 1 decay/s). D) the SI unit of absorbed dose = 1 J/kg = 100 rad. E) a dosage of 2.58 × 10-4 C/kg.

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Of all the planets, only ________ has surface features easily seen from Earth with ground-based telescopes

Fill in the blank(s) with correct word

Physics & Space Science

Which is the best description of Earth's orbit?

Which is the best description of Earth's orbit? A) It is nearly circular with Earth slightly closer to the Sun in summer in the northern hemisphere. B) It is nearly circular with Earth slightly closer to the Sun in winter in the northern hemisphere. C) It is highly elliptical with Earth slightly closer to the Sun in summer in the northern hemisphere. D) It is highly elliptical with Earth slightly closer to the Sn in winter in the northern hemisphere.

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Jason takes off from rest across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis have a thrust of 200 N and a coefficient of kinetic friction on water of 0.10

Unfortunately, the skis run out of fuel after only 67 s. How far has Jason traveled when he finally coasts to a stop? A) 5400 m B) 3800 m C) 10,000 m D) 7600 m

Physics & Space Science