- 100 km/h
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Dynamics of rigid bodies
3) The 2-Mg car has a velocity v1= 100 km/h of when the driver sees an obstacle in front of the car. If it takes 0.75 s for him to react and lock the
brakes, causing the car to skid, determine the distance, in meters, the car travels before it stops. The coefficient of kinetic friction between the tires
and the road is μk = 0.25.
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- EXAMPLE 4 | The Physics of an lon Propulsion Drive The space probe Deep Space 1 was launched October 24, 1998, and it used a type of engine called an ion propulsion drive. An ion propulsion drive generates only a weak force (or thrust), but can do so for long periods of time using only small amounts of fuel. Suppose the probe, which has a mass of 474 kg, is traveling at an initial speed of 275 m/s. No forces act on it except the 5.60 × 10-2-N thrust of its engine. This external force F is directed parallel to the displacement S, which has a magnitude of 2.42 × 109 m (see Figure 6.6). Determine the final speed of the probe, assuming that its mass remains nearly constant. Knowns and Unknowns The following list summarizes the data for this problem: F Figure 6.6 An ion propulsion drive generates a single force F that points in the same direction as the displacements. The force performs positive work, causing the space probe to gain kinetic energy. Reasoning If we can determine the final…51V1 O ©2023 ES AF VTV: 6:59 PM Sun Feb 20 6 Unit-5 Review A FA ALA LA FA 44 Question 8 70 kg ▶▶ 50 kg 490 N C Pause Q Zoom Two crates are dropped from the same height in a vacuum. The mass and force of the crates are shown in the diagram. 686 N Which of the following statements is supported by the data? O B. Both of the crates are accelerating at the same rate. Illuminate Education TM, Inc. O A. Both of the crates are falling at a constant speed. 1 A LA A LA Illuminate "Quick Code" The normal force will be the same on both crates when they hit the ground. T
- 2. Two blocks of masses ml and m2, with ml has greater mass than m2, are placed in contact with each other on a frictionless, horizontal surface as shown in the figure. A constant horizontal force is applied to ml as shown. Find the magnitude of the acceleration of the system. L.- (b) *Previous Next3. A system of masses is connected by a light cord passing over a pulley as shown m₁ = 2.5 kg य μ = 0.20 m₂ = 1.5 kg 40 a) Draw a labelled free body diagram for mass 2. b) What is the magnitude of the acceleration of the system of masses?B5
- 32 A rocket sled accelerates at a rate of 49.0 m/s² to a speed of 196 m/s. Then the rockets turn off and a parachute is used to decelerate the sled at a rate of 196 m/s². Its passenger has a mass of 75.0 kg. (a) Plot the position of the rocket sled as a function of time from when it starts to when it ends. (b) For the initial acceleration and (c) the deceleration, calculate (i) the distance traveled by the sled, (ii) the horizontal force on the self, and (iii) the physical form of the total force vector on the rider of the sled from her seat. (d) How far does the sled travel in total? (e) What is the average force on the sled over the entire motion?Problem 16 You can measure acceleration by measuring the deflection of a vertically hanging mass. Suppose an air freshener hangs from the rear view mirror of your car, which is initially at rest. You hit the gas pedal and notice that the air freshener is deflected at an angle of 15 degrees from the vertical. What is your car's acceleration?
- 2- Motion of a solid on a rail The rail ABCD, represented in the figure below, is situated in a vertical plane, the frictional forces are negligible on the parts AB and CD of the rail, but those on BC are equivalent to a force of magnitude f = 3 N. (S) B Given: h = 1.8 m, a = 30°, BC = 0.7 m and g = 10 m/s². %3D A punctual solid (S) of mass m = 0.25 kg is launched without speed from the point A. Applying the kinetic energy theorem on (S) calculate: 1)The speed of (S) at B ; 2)The speed of (S) at C ; 3)The length CD, where D is the highest point reached by (S) on CD.Two masses are connected by a light string that runs over a frictionless pulley as shown. What is the acceleration of the system when the masses are released and allowed to move?Q4 please