Your car is skidding to a stop from a high speed. Draw a free-body diagram of the car. Suppose that the car is moving to the right. Start with a black dot
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Your car is skidding to a stop from a high speed. Draw a free-body diagram of the car. Suppose that the car is moving to the right.
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- Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a slope of 32 degrees. a.) What is the minimum value of the coefficient of static friction that will keep the snow from sliding down? Express your answer using two significant figures. b.) As the snow begins to melt, the coefficient of static friction decreases and the snow finally slips. Assuming that the distance from the chunk to the edge of the roof is 5.0 m and the coefficient of kinetic friction is 0.10, calculate the speed of the snow chunk when it slides off the roof. Express your answer to two significant figures and include the appropriate units. c.) f the roof edge is 12.5 m above ground, estimate the speed of the snow when it hits the ground. Express your answer to two significant figures and include the appropriate units.Draw free-body diagrams for these situations. Be sure to draw your coordinate axes and draw separate FBDs for everything in the system and to write out the ? F = m a equations in all relevant dimensions. An apple falls out of a tree.A truck is moving at 15m/s when the brakes are applied, in order to come to a stop before hitting a pothole 20m ahead. In the back of the truck is a crate. It is not tied down, but has a coefficient of static friction μs = 0.4 with the truck bed. a.) Draw a free body diagram for the crate.
- A rifle shoots a 4.30 g bullet out of its barrel. The bullet has a muzzle velocity of 985 m/s just as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 43.0 cm starting from rest, with no friction between the bullet and the barrel. What force does the rifle exert on the bullet while it is in the barrel? b. Draw a free-body diagram of the bullet while it is in the barrel. Draw a free-body diagram of the bullet just after it has left the barrel. d. How many g 's of acceleration does the rifle give this bullet? e. For how long a time is the bullet in the barrel? a. с. The figDraw a diagram of the situation and label the givens in the problem: The cart's mass and the hanger's mass. Also label the direction of the cart and hanger's acceleration. Draw two force diagrams. One for the cart and one for the hanger. You can treat the track as frictionless. Remember that the force in the string will be the same throughout the entire string. Then define an x-y coordinate system and find the x and y components of the forces in your diagrams.A 15.0 kg load of bricks hangs from one end of a rope that passes over a small, frictionless pulley. A 28.0 kg counter weight is attached to the other end of the rope, as shown in the figure. You may model the rope as a massless string. The system is released from rest. A. Draw two freebody diagrams, one for the load of bricks and one for the counter weight. B. Find the magnitude of the upward acceleration of the load of bricks. 28.0 kg C. What is the tension in the rope? D. How does the tension compare to the weight of the bricks and the weight of the counter weight? 15.0 kg
- 1. A ball of mass m is attached to a string of length L. The ball is then swung in a circle of radius r such that the string traces out the surface of a cone. For this problem we will neglect air resistance. a. Sketch a pictorial representation of the physical situation and label any quantities of interest. In addition, establish a coordinate system for this problem and draw a free body diagram for the ball. (See sections 1.7 and 5.7 of the text on how to draw a correct pictorial representation and free body diagram.) b. Write down Newton's Second Law using the coordinate system from part (a) and the forces identified on your free body diagram. c. Determine a symbolic expression for the tension T in the string and the angular velocity w of the ball. These should be expressed in terms of the given quantities L, m, r and the acceleration due to gravity, g. Check the physical units of expressions to make sure that you get the units of force and angular velocity. your d. Suppose that we…A ВConsider the figure shown in the following figure. You are lowering two boxes, one on top of the other, down a ramp by pulling on a rope parallel to the surface of the ramp. Both blocks move with constant velocity of 10.0 [m/s]. The coefficient of kinetic friction between the ramp and the lower box is 0.555 and the coefficient of static friction between the two boxes is 0.750. A. Draw the Free-Body diagram of both blocks. Set the ?-axis parallel to the ramp. B. Write Newton’s 2nd law along the ? and ? directions for both blocks considering their state of motion (accelerations).
- Solve the problem. 1. You are working as a letter sorter in the Post Office. Postal regulations require that employees' footwear must have a minimum coefficient of static friction of 0.5 on a specified tile surface. You are wearing athletic shoes for which you do not know the coefficient of static friction. To determine the coefficient, you imagine that there is an emergency and start running across the room. You have a co-worker time you, and find that you can begin at rest and move 4.23 m in 1.20 s. If you try to move faster than this, your feet slip. Assuming your acceleration is constant, does your footwear qualify for the postal regulation?Draw free-body diagrams for these situations. Be sure to draw your coordinate axes and draw separate FBDs for everything in the system and to write out the ? F = m a equations in all relevant dimensions. A parachutist free-falls and then opens her parachute. Draw FBDs for both parts of her travel.A ball hanging from a light string or rod can be used as an accelerometer (a device that measures acceleration) as shown in Figure P5.18. What force causes the deflection of the ball? Is the cart in the lower part of the photo an inertial reference frame? How can the balls deflection be used to find the carts acceleration? In which direction is the cart accelerating? Explain your answers.