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A hunter is standing on flat ground between two verticalcliffs that are directly opposite of each other. He is closerto one cliff than the other. He fires a gun, after a while,hears three echoes. The second echo arrives 1.6s after thefirst, and the third echo arrives 1.1s after the second. Assuming that the speed of sound is 343 m/s and that there are noreflections of sound from the ground, find the distance between the cliffs.
A bullet of mass 0.0022 kg initially moving at 496 m/s embeds itself in a large fixed piece of wood and travels 0.64 m before coming to rest. Imagine that an acceleration of the bullet is constant.
A 41-kg box is thrown at a speed of 220 m/s & is brought to a halt in a collision that lasts for a time of 6.5 m/s. Find the magnitude of the average net force that acts on the box during the collision.
Two point charges of equal magnitude are 7.3cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 40N/C . Find the magnitude of the charges.
100 grams of oxygen and 100 grams of hydrogen gas occupy separate, equal sections of 200 liter tank. find the pressure after the reaction ends
A steel cable with total length 20 m and mass 100 kg is connected to two poles. The tension in the cable is 2,000 N, and the wind makes the cable vibrate with a frequency of 2 Hz. compute the wavelength of the resulting wave on the cable.
A 5.0-g piece of copper is to be formed into a wire of radius 1.5 mm at a temperature of 40°C. What is the resistance of this wire
A 1.2 m long steel rod with a diameter of 0.50cm hangs vertically from the ceiling. An auto engine weighing 4.7kN is hung from the rod. By how much does the rod stretch
Consider the following reaction: where has a mass of 14.003 074 u; has a mass of 12.000 000 u; d has a mass of 2.014 102 u; How much energy is released in this reaction
If a 200 N force F1 is applied to the piston with the 4 cm diameter, Calculate the magnitude of the force F2 that can be resisted by the piston with the 10 cm diameter? Ignore the weights of the pistons.
A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.08 m × 1.86 m. On a certain day, the indoor temperature is 27°C and the outdoor temperature is 0°C. (Assume the thermal conductivity of the glass is 0.8 J/s · m · °C.)
You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. If you catch the ball, with what speed do you and the ball move afterwards
A person stretches a rope of length 55 m between the top of a building to the base of a tree d = 23 m away. How tall is the building.
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