For safety in climbing, a mountaineer uses a 50-m long nylon rope that is 1.0 cm in diameter. When supporting a 90-kg climber, the rope elongates 1.6 m. Find the Young's modulus for the rope material
3.51 × 10^8 N/m2
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A(n) ____________________ universe is infinite and would have a density equal to the critical density
Fill in the blank(s) with correct word
When an electron passes through the magnetic field of a horseshoe magnet, the electron's
A) speed is increased. B) direction is changed. C) both of these D) neither of these
A satellite in circular orbit around the Earth moves at constant speed. This orbit is maintained by the force of gravity between the Earth and the satellite, yet no work is done on the satellite.
A. No work is done because there is no gravity in space. B. No work is done if objects move in a circle. C. No work is done if the direction of motion is perpendicular to the force. D. No work is done if there is no contact between objects.
An atom that has fewer electrons than protons is called a(n) ________
A) ion B) molecule C) plasma D) solid