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Question: A projectile is fired directly upward at such an initial velocity that it reaches half its height of 45 meters. Calculate its speed at the following intervals:
a. Determine the speed of the projectile at the top of the trajectory.
b. Determine the speed at which it impacts the ground on its return.
Two narrow slits 55 micrometer apart are illuminated with light of wavelength 507nm. What is the angle of the bright fringe in degrees
A house has a floor area of 120 m2 and an outside wall that has an area of 31 m2. The earth's magnetic field here has a horizontal component of 2.60 10-5 T that points due north and a vertical component of 5.00 10-5 T that points straight down, to..
An astronomical telescope has an angular magnification of -144, What is the focal length of the eyepiece
A wooden raft has a mass of 55 kg. When empty it floats in water (density 100 kg/m^3 with 64% of its volume submerged. What mass of sand can be put on the raft without it sinking
What would be the angle of the first diffraction pattern for a 650 nm laser submerged in water (n=1.33), if the diffraction grating has 800 lines per mm
X-rays of wavelength 0.140 nm are scattered from a crystal, What is the interplanar spacing for this crystal
A helicopter is ascending vertically with a speed of 5.57. At a height of 124 above the Earth, package is dropped from a window. How much time does it take for the package to reach the ground?
A snow maker at a resort pumps 260 kg of lake water per minute and sprays it into the air above a ski run. how much heat does the snow-making process release each minute
A 4.50 -kg ball is dropped from a height of 10.0 m above one end of a uniform bar that pivots at its center. How high will the other ball go after the collision
A parallel-plate capacitor has an area of 100 x 100?m^2. Calculate the capacitance values for two distances between the electrode plates: 1 and 0.5 µm. The medium is air. If the bias (voltage) in (a) is 3V, what is the attractive force?
Refrigerant-22 enters a turbine at 300 psi, 280°F, 2000 ft3/hr. The exit is at 15 psi, 10°F. Find the mass flow rate
A block (mass = 1.8 kg) is hanging from a massless cord that is wrapped around a pulley (moment of inertia = 1.2 x 10-3 kg·m2), find the angular acceleration of the pulley
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