5) Are the statements below correct? a) 1. Considering two different ways in the figure to push two identical heavy boxes to move at a constant speed, both cases a) and b) experience the b) same kinetic friction force. 2. With the presence of kinetic friction, a brick pulled by gravity can still slide down an inclined plane at a constant acceleration. 3. If a round object undergoes pure rolling downhill on an inclined plane, the friction force exerts zero torque to the object.
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- 2) In the pulley/string system shown at the right, the radius of pulley A is 2.0 cm and the radius of pulley B is 5.0 cm. The block is moving downwards with a speed of 2.0m/s. a) What is the angular speed of pulley A? b) What is the angular speed of pulley B? A BA tall crate has a higher center of gravity than a shorter crate. Which will have the greater tendency to tip over if we push near the top of the crate? Explain with a force diagram. Where is the probable axis of rotation? Answer this correctly and completely, please. Draw a force diagram to explain the force as asked in the question.A sphere SLIDES down the incline. what can we say for sure? A) there is no kinetic friciton but there is static friction B) there is no static friction but there is kinetic friction C) the torque of weight is positive D) the weight is completely canceled by the normal force E) there is no static or kinetic friction
- If a wheel is turning with a constant net torque applied, which of these quantities will be changing? Select one: a. Angular acceleration b. Tangential acceleration c. Centripetal acceleration d. All three will be changing e. All three will be constantA dentist using a dental drill brings it from rest to maximum operating speed of 360,000 rpm in 4.0 s. Assume that the drill accelerates at a constant rate during this time. (a) What is the angular acceleration of the drill in rev/s2? rev/s2 (b) Find the number of revolutions the drill bit makes during the 4.0 s time interval. rev5. The figure below illustrates an Atwood's machine. Let the masses of blocks A and B be 4.00 kg and 2.00 kg, respectively, the moment of inertia of the wheel about its axis be 0.100 kg.m² and the radius of the wheel be 0.500 m. a) Find the linear acceleration of block A and block B if there is no slipping between the cord and the surface of the wheel b) Find the tension in right side of the cord if there is no slipping between the cord and the surface of the wheel c) Find the tension in left side of the cord if there is no slipping between the cord and the surface of the wheel.
- Problem 6 - Rolling without slipping A solid ball of uniform density with mass M and radius R rolls without slipping on an incline that makes an angle of 0 with the horizontal, as shown in Fig.6. Recall that the 2MR2 moment of inertia of a solid ball about an axis passing through its center is Icm = 5 ст a) Draw an "extended" free body diagram of the ball indicating where every force acts on the ball. b) What is the angular acceleration of the ball? K-D- c) How fast is the ball's center of mass moving after it has rolled a distance D along the ramp, starting from rest? d) What is the minimum value of the coefficient of static friction u, between the ball and the ramp? e) At any moment in time, what fraction of the ball's total kinetic energy is the rotational about the ball's center of mass? kinetic Figure 6 energyA 5.7 g quarter sits 25 cm from the axis of rotation on a turntable that has a period of rotation of 1.8 seconds. a) Draw a free-body diagram showing the forces involved. b) What is the weight of the quarter inNewtons? Round to the nearest hundredth. c) What is the NORMAL FORCE acting on the quarter. d) Determine the coefficient of static friction be in order to keep the quarter from sliding outward when the turntable is in motion?A 95 N force exerted at the end of a 0.50 m long torque wrench gives rise to a torque of 15 N. m. What is the angle (assumed to be less than 90°) between the wrench handle and the direction of the applied force? A) 20° B) 25° 18° 22°
- For each of the situations below, determine which forms of Newton's second law (N2L) are appropriate: N2L rotation, N2L translation, either, or both. You are asked to find the angular acceleration of a low-friction pulley with a given force exerted on it. You are asked to find the angular acceleration of a low-friction pulley due to a mass hanging from it by a rope. You are asked to determine the maximum height of a spinning ball that is thrown upwards. You are asked to calculate the time it takes a ball to roll down an inclined plane. You are asked to find the tangential acceleration of a small satellite in a circular orbit that results from it firing its thruster. You are asked to determine the orbital period of a small satellite around Earth.Ferrari Testarossa uses a single lug nut.The bolts on a normal car wheel require tightening to a torque of 90N∙m. If a 30 cm long wrench is used, what is the magnitude of theforce required when the force is perpendicular to the wrench?A) 300 NB) 150 NC) 30 ND) 15 N