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a park ranger wanted to measure the height of a tall tree. The ranger stood 9.50 m from the base of the tree; and he observed that his line sight made an angle of 73.5 degrees above the horizontal as he looked at the top of the tree. What is the height of the tree?
What is the force acting on the board because of the left support when a diver of mass 63.20 kg stands at the end of the board over the water? Suppose that these forces are vertical.
A thin rectangular plate of uniform areal density ? = 2.90 kg/m2 has length of 34.0 cm and width of 24.0 cm. There is a circular hole of radius 6.00 cm with center at (x,y) = (11.00,10.00) cm in the plate. Calculate the mass of plate
A charge Q = 23.0 ?C is distributed evenly on a wire bent into an arc of radius R = 47.0 cm, What is the electric field at the center of the arc that subtends ? = ±40.0°
A spherical weather balloon is filled with hydrogen until its radius is 3.40 m, Find the buoyant force acting on the balloon, assuming the density of air is 1.29 kg/m3.
A 3-kg steel ball strikes a wall with a speed of 13-m/s at an angle of 60.0° with the surface. It bounces off with the similar speed and angle. If the ball is in contact with the wall for 0.20s, what is the average force exerted by the wall on the..
Mattwe pulls his little sister sarah in a sled on an icy surface, with a force of 60 N at an angle of 37 ° upward from the horizontal. If he pulls her a distance of 12m, then determine the work done by matthew?
Illustrate what should be the other mass so that the displacement of either mass during the first second following release is 0.34 m? Assume a massless, frictionless pulley and a massless string.
A toy train is pushed forward and released at = 2.0 with a speed of 1.5 . It rolls at a steady speed for 2.8 , then one wheel begins to stick. The train comes to a stop 5.6 from the point at which it was released. Elucidate the train's accelera..
while you take a bath, how many kilograms of hot water (50°C) have to you mix with cold water (11 °C) so that the temperature of the bath is 36 °C? The total mass of water (hot plus cold) is 194 kg. Ignore any heat flow between the water and its e..
A solid cylinder with mass and radius, rotating with angular speed about an axis throughout its center, is set on the horizontal surface for which the kinetic friction coefficient is.
A 41 cm long solenoid 1.20 cm in diameter is to produce a field of 0.395 mT at its center. How much current should the solenoid carry
A 0.2kg aluminum plate, initially at 20C, slides down at a 15.00 m long surface, incline at a 30 degree angle to the horizontal. The force of kinetic friction exactly balances the component of gravity down the plane so that the plane.
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