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A car starts moving rectilinearly, first with acceleration w = 5.0 m/s2 (the initial velocity is equal to zero), then uniformly, and finally, decelerating
A cannon fires successively two shells with velocity vo = 250 m/s; the first at the angle ?1 = 60° and the second at the angle ?2 = 45° to the horizontal
A cannon and a target are 5.10 km apart and located at the same level. How soon will the shell launched with the initial velocity 240 m/s
When a woman in high heels takes a step, she momentarily places her entire weight on one heel of her shoe, which has a radius of 0.4 cm
When submerged in water, a block of copper has an apparent weight of 56 N. What fraction of this copper block will be submerged if floated on a pool of mercury?
A skier is accelerating down a 30.0o hill at 1.80/s2 (Fig), what is the vertical component of her acceleration?
You cast some metal of density Pm in a mold, but you are worried that there might be cavities wit13in the casting
You are preparing some apparatus for a visit to a newly discovered planet Caasi having oceans of glycerin and a surface acceleration due to gravity
You are designing a diving bell to withstand the pressure of seawater at a depth of 250 m.
When the hydrometer is placed in a liquid whose specific gravity is greater than some minimum value the device floats with part of the glass tube
When the ground becomes saturated with water during floods, pressure develops similar to the pressure of water contained in a vessel of the same volume.
A ball is thrown straight upward so that it reaches a height h. It falls down and bounces repeatedly
A ball is dropped from rest at height h, and it bounces off a surface at height y (with no loss in speed). The surface is inclined so that the ball bounces
At what upstream angle must the swimmer aim, if she is to arrive at a point directly across the stream?
You purchase a rectangular piece of metal that has clemencies 5.0 x 15.0 x 30.0 nun and mass 0.0158 kg. The seller tells you that the metal is gold.
You drill a small hole in the side of a vertical cylindrical water tank that is standing on the ground with its top open to the air
What diameter must a 21.0-m-long air duct have if the ventilation and heating system is to replenish the air in a room 9.0 m X 12.0m X 4.0m every 10min?
Water runs into a fountain, filling all the pipes, at a steady rate of 0.750 rn/S3.
Water is pumped steadily out of a flooded basement at a speed of 5.0 m/s through a uniform hose of radius l.0 cm.
Water is flowing at 3 m/s in a horizontal pipe under a pressure of 200 kPa. The pipe narrows to half its original diameter.
Water flows through the pipe in Figure and exits to the atmosphere at C. The diameter of the pipe is 2.0 cm at A, 1.0 cm at B, and 0.8 cm at C.
When a pilot takes a tight turn at high speed in a modern fighter airplane, the blood pressure at the brain level decreases blood no longer perfuse the brain
What must be the pressure difference between the two ends of a 1.9-km section of pipe. 29cm in diameter, if it is to transport oil (p = 950kg/m3.n = 0.20Pa s)
What is the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is 1.39
What gauge pressure must a pump produce to pump water from the bottom of the Grand Canyon (elevation 730 m) to Indian Gardens (elevation 1370 m)?