The mass center of the rear-engine 1530-Kg car is at G. The coefficient of static frid a 600'mm
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- A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.The mass center of the rear-engine 1410-Kg car is at G. The coefficient of static friction is 0.74 at driving tire/road interfaces. 600'mm B 1500 1500 mm mm initial acceleration if it is four wheel driven car (m/s²) а. 7.3 b. 8.7 c. 5.8 d. 10.2 е. 2.9 normal reaction at rear wheel if it is four wheel driven car (N) normal reaction at rear wheel if it is rear- wheel driven car (N) а. 11353 O b. 9731 c. 6487 d. 8109 e. 12975 initial acceleration at rear wheel if it is rear- wheel driven car (m/s?) time to reach a speed of 80 km/h, if it is rear- wheel driven car a. 8.35 о Б.6.26 с. 5.22 d. 7.3 е. 2.09
- B r P F A UBC Engineering Your team is prototyping a simple braking system for your model car. The 3.4 kg wheel with a radius of r = rad 0.15 m is rotating at w = 18 - .A servo motor can apply a variable force F, which in its first two seconds of operation is equal to F = 10t N and afterwards is equivalent to a constant force of F = 20 N . If the coefficient of kinetic friction between the braking arm and the wheel is μ= 0.2, determine the time needed for the wheel to come to a full stop. The point of contact P between the wheel and the arm is a distance r = -0.2 + 0.26 ĵ m from point A. The force of the servo motor is applied at exactly half of the horizontal distance to A from the point of contact. Assume the wheel can be treated as a disk and that the braking arm is massless. t =The mass center of the rear-engine 1530-Kg car is at G. The coefficient of static friction is 0.5 at driving tire/road interfaces. a OG 600'mm B 1500 1500 mm mm initial acceleration if it is four wheel driven car (m/s²) а. 4.9 b. 5.9 с. 3.9 d. 6.9 е. 2 normal reaction at rear wheel if it is four wheel driven car (N) normal reaction at rear wheel if it is rear- wheel driven car (N) a. 13328 b. 9996 c. 8330 d. 11662 е. 3332 initial acceleration at rear wheel if it is rear- wheel driven car (m/s²) time to reach a speed of 92 km/h, if it is rear- wheel driven car a. 15.03 b. 11.27 c. 9.4 d. 13.15 е. 3.76 O OA constant moment M in the clockwise direction is applied to a 20-lb thin disk in contact with an inclined surface. The kinetic friction coefficient is k at the point of contact D. Determine the magnitude of the angular acceleration of the disk by neglecting the weight of the link AB, if M = 7.5 lb-ft and = 0.4. Present your answer in rad/sec² using 3 significant figures. 1 in = 1/12 ft. 9 in. B M 30° D
- A constant moment M in the clockwise direction is applied to a 20-lb thin disk in contact with an inclined surface. The kinetic friction coefficient is at the point of contact D. Determine the magnitude of the angular acceleration of the disk by neglecting the weight of the link AB, if M = 7.5 lb-ft and =0.4. Present your answer in rad/sec² using 3 significant figures. 1 in = 1/12 ft. 9 in. B M 30° DA block of mass M = 10 kg is sitting %3D on a surface inclined at angle 0 45°. Given that the coefficient of static friction is equal to 0.5 between block and surface, what is the maximum force F that can be exerted without causing the block to slip? F M Select one: а. 69 N b. 35 N c. 98 NA constant moment M in the clockwise direction is applied to a 20-lb thin disk in contact with an inclined surface. The kinetic friction coefficient is k at the point of contact D. Determine the magnitude of the angular acceleration of the disk by neglecting the weight of the link AB, if M = 7.5 lb-ft and k = 0.4. Present your answer in rad/sec² using 3 significant figures. 1 in = 1/12 ft. A 9 in. M B ww M 30° D
- Page 6 of 8 8. Figure 7 shows a four-wheel drive car of mass m = 970 kg. The coefficients of friction is u=0.6. Neglect the mass of the tyres. (a) Determine the greatest possible acceleration of the race car so that its front tyres do not kave the ground nor the tyres slip on the track. (b) Determine the corresponding reactions on tyres A and B. (c) From (b) above, recalculate the coefficient of friction. If it is not same as either the given values H, or Hk, then in one sentence, state or explain why the difference in values? h=0.55 m a= 1.82 m B b = 2.20 m Figure 7 Page 7 of 8A vehicle krying a wheel base before coming to rest on applying the brakes to the (i) rear wheels (ii) front wheels (iii) all the four wheels The coefficient of friction between the tyres and the road is 0.5. of 3.2 nf 3 a centre of mass at 1.4 t f J3.3 he rear wheels and 55 AL3 grom the ground level. It moves on a level ground at a speed of 54 km/h. Determine the distance moved by the car8. Figure 7 shows a four-wheel drive car of mass m = 970 kg. The coefficients of friction is H=0.6. Neglect the mass of the tyres. (a) Determine the greatest possible acceleration of the race car so that its front tyres do not kave the ground nor the tyres slip on the track. (b) Determine the corresponding reactions on tyres A and B. (c) From (b) above, recaleulate the coefficient of friction. If it is not same as either the given values Hs or k, then in one sentence, state or explain why the difference in values? h=0.55 m a= 1,82 m b = 2.20 m Figure 7