Question: Two bodies A (of mass 1 kg) and B (of mass 3 kg) are dropped from heights of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is (a) 4/5 (b) 5/4 (c) 12/5 (d) 5/12
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- A mass of m = 0.500 kg slides across a horizontal frictionless counter with a speed vo= 0.300 m/s. It then runs into and compresses a spring of spring constant k-750 N/m. ୪୪୪୩ d O Weight, Normal, Spring Force, Friction O Weight, Spring Force, Friction O Weight, Normal, Spring Force O Weight, Normal, Friction Physics Principles (a) Pick all forces act on the spring-mass system as the mass compresses the spring. (b) Which of these forces do not do any work? C C -VO Weight, Normal Force, Spring Force Weight, Normal Force Normal, Spring Force Weight, Friction mA rifle bullet with a mass of 5 g traveling toward the right at 206 m/s strikes a large bag of sand and penetrates it to a depth of 0.3 m. Determine the magnitude and direction of friction force (assume constant) that acts on the bullet.If a 2 kg object is initially at rest on a frictionless, horizontal surface and subjected to a 13.7 N force in the positive x-direction over a distance of 3.25 meters, what will the object’s final speed be? Assume the answer in in m/s.
- A robot drops a 1.2kg package from the roof of a building 12.4m tall. Ignoring wind resistance, with what force does the package hit the ground? A second robot drops a Nerf ball off the same roof, 12.4 m tall. The Nerf ball has a mass of 0.001kg. Which one (package or Nerf ball) hits the ground sooner?You are driving your car on a straight road with a coefficient of friction between the tires and the road of 0.55. A large piece of debris falls in front of your view and you immediate slam on the brakes, leaving a skid mark of 30.5 m (100-feet) long before coming to a stop. A policeman sees your car stopped on the road, looks at the skid mark, and gives you a ticket for traveling over the 13.4 m/s (30 mph) speedlimit. Draw the FBD of the car with complete details.A small diamond of mass 13.3 g drops from a swimmer's earring and falls through the water, reaching a terminal velocity of 2.1 m/s. (a) Assuming the frictional force on the diamond obeys f = −bv, what is b (in kg/s)? (Round your answer to at least four decimal places.) kg/s (b) How far (in m) does the diamond fall before it reaches 90 percent of its terminal speed? m
- The only force acting on a 1.7 kg body as it moves along the positive x axis has an x component Fx = -4x N, where x is in meters. The velocity of the body at x = 2.0 m is 11 m/s. (a) What is the velocity of the body at x = 3.7 m? (b) At what positive value of x will the body have a velocity of 2.2 m/s? (a) Number 9.91 (b) Number i 7.75 Units Units m/s mA freight train consists of two 8.00×104 kg5.60×104 kg engines and 45 cars with average masses of 5.50×104 kg5.50×104 kg. (a) What force must each engine exert backward on the track to accelerate the train at a rate of 4.00×10−2 m/s if the force of friction is 6.20×105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?Your answer is partially correct. The only force acting on a 4.5 kg body as it moves along the positive x axis has an x component F,= -4x N, where x is in meters. The velocity of the body at x = 1.4 m is 10 m/s. (a) What is the velocity of the body at x = 3.2 m? (b) At what positive value of x will the body have a velocity of 2.0 m/s? (a) Number 9.62 (b) Number 1.94 eTextbook and Media Units Units m/s m
- A dated box of dates, of mass 7.1 kg, is sent sliding up a frictionless ramp at an angle of 0 to the horizontal. The figure here gives, as a function of time t, the component Vy of the box's velocity along an x axis that extends directly up the ramp. What is the magnitude of the normal force on the box from the ramp? v, (m/s) 2 t (s) -2 Number T66.24 Unit N the tolerance is +/-2%- Click if you would like to Show Work for this question: Open Show Work 11:55 PM A ENG o search 4/4/2021 ASUS pause break insert delete |home prt sc 13) 2#3 backs 9. E R 近 3.A 6.3-kg toboggan is kicked on a frozen pond, such that it acquires a speed of 2.2 m/s to the right. The coefficient of friction between the pond and the toboggan is 0.18. Determine the distance that the toboggan slides before coming to rest. Answer: m (round to the nearest hundredth)