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What is the angle between the two vectors
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As a comet swings around the Sun, ice on the comet's surface vaporizes, releasing trapped dust particles and ions. The ions, because they are electrically charged, are forced by the electrically charged solar wind into a straight ion tail that points radially away from the Sun (Fig....
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A projectile is fired straight upward at 134 m/s. How fast is it moving at the instant it reaches the top of its trajectory? 1 m/s Suppose instead it were fired upward at 37 . What would be its speed at the top of its trajectory? 2 m/s
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a skier with mass of 80.0 kg starts from rest and skis down a slop from an elevation of 110.0 m. The speed of the skier at the bottom of the slope is 20.0 m/s. How much work is done by the nonconservative force of friction?
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The drawing shows a uniform horizontal beam attached to a vertical wall by a frictionless hinge and supported from below at an angle = 38o by a brace that is attached to a pin. The beam has a weight of 343 N. Three additional forces keep the beam in equilibrium. The brace applies a force P to...
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On one particular shot, his 1.0 g pellet gets stuck in the cheese, causing it to slide 25 cm before coming to a stop. If the muzzle velocity of the gun is 64 m/s and the cheese has a mass of 98 g, what is the coefficient of friction between the cheese and ice
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how does f number in ionized gas changes
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A 2.00 m tall basketball player wants to make a goal from 10.0 m from the basket, as in Figure P3.58. If he shoots the ball at a 45.0 angle, at what initial speed must he throw the basketball so that it goes through the hoop without striking the backboard?
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A 747 airliner reaches its takeoff speed of 170 mi/h in 35.8 s.What is the magnitude of its average acceleration
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A loudspeaker of mass 17.0 {\rm kg} is suspended a distance of h = 1.80 {\rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 2.70 {\rm m}. What is the tension T in each of the cables? Use 9.80 {\rm m/s}^2 for the magnitude of the...
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- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
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- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas
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