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A fire truck attaches two fire hoses to a hydrant to fight a fire. Each hose has a diameter of 20 cm. The underground water pipe going to the hydrant has a diameter of 100 cm. In the underground pipe, the water has a speed of 2.0 m/s.
(a) How many kilograms of water are put on the fire in 30 minutes.
(b) What is the speed of the water in the fire hoses?
A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.54 hours. What is density of the planet
A hang glider and its pilot have a total mass equal to 119 kg. While executing a 360° turn, What is the net force on the hang glider
Two point charges are placed on the x-axis. A charge -q is located at the origin, and a charge -2q is located at x = +d. at what location is the total electric potential zero
An astronaut constructs a pendulum with a length of 1 meter on a new planet. what is the acceleration due to gravity
A bird flies 25.0 m in the direction 55° east of south to its nest. What are the northward and westward components of the resultant displacement of the bird
Sound is passing perpendicularly through an open window whose dimensions are 1.1 m x 0.75 m. How much sound energy comes through the window in one hour
Bob holds a ball at a height of 2.5 m above the ground and tosses it vertically upward with an initial speed of 3.5m/s. How long does it take his ball to reach the ground
A string fixed at both ends is vibrating in its 8th harmonic. How many nodes are on the string
A 75 kg person escapes from a burning building by jumping from a window 25-m above a catching net. Assuming that air resistance exerts a 95-N force on the person all through the fall, determine out the person's velocity just before hitting the net..
When he reaches equator, the sphere is rotating at how many rpm. A car takes 9 s to go from v = 0 to v = 55 m/s at about constant acceleration.
A charged particle A exerts a force of 2.69 ?N to the right on charged particle B, when the particles are 14.0 mm apart. Particle B moves straight away from A to make the distance between them 17.0 mm. What vector force does it then exert on A?
A swimming pool 2.6 m by 1.0 m has a uniform depth of 2.0 m, What is the absolute pressure at the bottom of the pool
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