Venus is visible in the west after sunset or in the east before sunrise
Indicate whether the statement is true or false
True
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A contact lens is made of plastic with an index of refraction of 1.50 . The lens has an outer radius of curvature of +2.0 cm and an inner radius of curvature of +2.5 cm. What are the focal length and the power of the lens?
(Ignore air resistance for this problem.) Two identical balls are thrown simultaneously from the top of a very tall cliff. Ball A is thrown downward with an initial velocity of 6 m/s, while ball B is thrown straight upward with an initial velocity of 9.8 m/s. After one second has elapsed, the
A. acceleration of ball A is upward. B. velocity of ball A is 9.8 m/sec2. C. velocity of ball B is zero. D. acceleration of ball A is greater than that of ball B. E. acceleration of both balls is zero.
A thin ribbon of a silver alloy 2.00-cm wide and 0.015 0-mm thick carries a current of 6.98 A perpendicular to a magnetic field. The Hall voltage is found to be 1.24 × 10?4 V when the magnetic field is 2.50 T. Calculate n, the number of charge carriers per cubic meter.
What will be an ideal response?
When water of mass m and specific heat c is heated at constant pressure from absolute temperature T1 to absolute temperature T2, its change in entropy is what?
a. cm ln(T2/T1) b. cm (T2/T1) c. cm (T2 ? T1)/T1 d. cm (T2 ? T1)/T2 e. cm (T2 ? T1)/(T2 + T1)