The driver of a motorboat that can move at 10 m/s wishes to travel directly across a narrow strait in which the current flows at 5 m/s
(a) At what angle upstream should the driver head the boat?
(b) How long will it take to cross a distance of 1.6 km?
(a) 26.6°
(b) 179 s
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How does the gravity of an object affect light?
A) Light doesn't have mass; therefore, it is not affected by gravity. B) Light coming from a compact massive object, such as a neutron star, will be redshifted. C) Light coming from a compact massive object, such as a neutron star, will be blueshifted. D) Visible light coming from a compact massive object, such as a neutron star, will be redshifted, but higher frequencies such as X-rays and gamma rays will not be affected. E) Less energetic light will not be able to escape from a compact massive object, such as a neutron star, but more energetic light will be able to.
All of the following statements about the Sun's corona are true. Which one explains why it is a source of X-rays?
A) The temperature of the corona's gas is some 1 to 2 million Kelvin. B) The corona lies above the visible surface of the Sun. C) The corona's gas consists mostly of hydrogen and helium. D) The corona's structure is largely shaped by magnetic fields.
The primary winding of an electric train transformer has 400 turns and the secondary has 50 . If the input voltage is 120V(rms) what is the output voltage?
a. 15 V (rms) b. 30 V (rms) c. 60 V (rms) d. 2.4 V (rms) e. 960 V (rms)
Torque: A rigid rectangular loop, measuring 0.30 m by 0.40 m, carries a current of 5.5 A, as shown in the figure. A uniform external magnetic field of magnitude 2.9 T in the -x direction is present. Segment CD is in the xz-plane and forms a 35° angle with the z-axis, as shown. What is the magnitude of the torque that the magnetic field exerts on the loop?
A. 1.1 N ? m B. 0.73 N ? m C. 1.3 N ? m D. 1.4 N ? m E. 1.6 N ? m