A batter hits a baseball 1.0 meter above the ground at a 25° angle and an initial velocity of 45 m/s. Assume no air resistance. a. What is the ball’s height above the field and distance from home plate 1.0 seconds and 2.0 seconds after it was hit?

b. What is the ball’s velocity at 1.0 seconds and 2.0 seconds? Velocity is a vector quantity and you must determine the magnitude and direction of the ball.

c. The center field fence is 125 meters away and 3.0 meters high. Did the batter hit a homerun? Show your calculations. Assume the center fielder cannot catch the ball. (Get time in x-direction!)

The lights used by mark watley (played by matt damon) during the film the martian seem to be metal halide lamps. metal halide lamps are filled with vaporized mercury and metal-halogen compounds. when an electric current is passed through the lamp, the tube begins to glow a bright white/blue color. if you were to pass this light through a prism to separate the individual light frequencies, you would see a rainbow just as you would if using natural sunlight because of the complexity of the metal halide gas and the vast amount of possible electron transitions. (the study of light in this way is known as spectroscopy and allows astronomers to know exactly what atoms compose distant stars, simply by looking at the light they emit. the spectral lines an atom produces uniquely identifies that atom just like a fingerprint uniquely identifies a person. the momentum equation and energy equation that we have used above can be combined to give the following equation: c = e p where again p is the phonon momentum, e is the photon energy and c is the speed of light. when you divide the photon energy found in #6 by the photon momentum found in #4, do you get the speed of light? (if not, check your work for questions #4 through #6). yes no

Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2