A Hubble Constant of H = 70 km/sec/ Mpc suggests a maximum age for the universe of ________
Fill in the blank(s) with correct word
about 14 billion years.
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An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. The direction of the electric field vector of this wave is
A) horizontal and pointing south. B) vertical and pointing down. C) horizontal and pointing north. D) vertical and pointing up. E) horizontal and pointing east.
The process of changing the shape of the lens, and hence adjusting its focal length, is referred as accommodation
Indicate whether the statement is true or false
A 1.5-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 20 cm horizontally from the equilibrium position and released from rest, the block first reaches the equilibrium position with a speed of 2.0 m/s. What is the coefficient of kinetic friction between the block and the horizontal
surface on which it slides? a. 0.34 b. 0.24 c. 0.13 d. 0.44 e. 0.17
A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 turns/m, current = 50 mA). The wire segment is oriented perpendicularly to the axis of the solenoid. If the current in the wire segment is 12 A, what is the magnitude of the magnetic force on this segment?
a. 22 mN b. 16 mN c. 18 mN d. 12 mN e. 0 mN