A spacecraft (mass = m1) orbits a planet (mass = m2) in a circular orbit (radius = r). What is the minimum energy required to send this spacecraft to a distant point in space where the gravitational force on the spacecraft by the planet is negligible?
A. Gm1m2/(4r)
B. Gm1m2/R
C. Gm1m2/(2R)
D. Gm1m2/(3R)
E. 2Gm1m2/(5R)
Answer: C
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a. 700 N c. 8000 N b. 4000 N d. 16,000 N
Briefly explain spectrographs, and describe the experiment that led Isaac Newton to conclude that white light is made of a mixture of colors
What will be an ideal response?
In an elastic collision between two bodies of mass m1 and m2, with m2 initially at rest, mass 1 moves off at angle ? relative to the direction of its initial velocity and mass 2 at angle ?. An exam paper shows the equations below: m1v1i 0 = m1v1f cos? + m2v2f sin? = m1v1f sin? + m2v2f cos? What error(s) has the student made?
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The figure shows the orientation of a rectangular loop consisting of 80 closely wrapped turns each carrying a current I. The magnetic field in the region is (
) mT. The loop can turn about the y axis. If ? = 30°, a = 0.40 m, b = 0.30 m, and I = 8.0 A, what is the magnitude of the torque exerted on the loop?
?
?
A. 2.5 N ? m B. 1.5 N ? m C. 3.1 N ? m D. 2.7 N ? m E. 0.34 N ? m