You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 43.0 mph. The cars locked bumpers and slid eastward with their wheels locked for 17.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . What speed ? (in miles per hour) was car A traveling just before the collision? (This problem uses English

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A: The ball is placed on the edge of a cliff, which has a height of 10 m At t=0 s, the ball is kicked…

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A: The mass of the string: M=103 g=0.103 kg The length of the string: L=3.2 m The hanging mass: m=6.6…

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Q: A 4.3-kg model rocket is launched, shooting 55.8 g of burned fuel from its exhaust at an average…

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Q: A cylinder has a radius of 2.1cm and a length of 8.8cm. Total charge 6.1 X 10^ -7 C is distributed…

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Q: Find the x-component of this vector. 80.0° B-18.6 m 0 = 170° Bx = [?] m Hint: Bx = B cos(0)

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Q: In fig. 197, on the axis of the metallic ring of radius R=30 cm and charge Q = +3 x 10-¹0C uniformly…

A: Q = 3×10-10 CR = 30 cm = 0.3 me = -1.6×10-19 Cme = 9.1×10-31 kg

Q: An object has an excess charge of -1.6 x 10-17 C. How many excess electrons does it have?

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Q: Calculate the amount of heat transferred when 7.0 kg of water cools from 52.1 oC  to 10.8 oC…

A: Mass ( m ) = 7 kg  Temperature ( Ti ) = 52.1 °C  Temperature ( Tf ) = 10.8 °C

Q: How much resistance does a heavy-duty flashlight have if it has a current of 15 mA flowing through…

A: The current through flashligth is 15 mA. The voltage across each cell is 9 V.

Q: 29. The position of a particle for t> 0 is given by r(t) = (3.0t² Î-7.0t³ -5.0t² k) m. (a) What is…

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Q: A standing sound wave in air in a tube is shown below. The length of the tube is 0.650 m.

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Q: wo objects gravitationally attract with a force of 1,713 N.  If mass 1 is multiplied by 4.78, mass 2…

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Q: 18. Achild sits on a sled at the top of a hill, the hill makes an angle of 20° with the horizontal.…

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Q: 13. Two masses are moving towards each other on a horizontal, frictionless surface. One has a mass…

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Q: Suppose a car travels 108 km at a speed of 40.0 m/s, and uses 1.80 gallons of gasoline. Only 30% of…

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: