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- A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 N on him. The mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20 m/s2 backward. (a) What is the force of friction between the losing player's feet and the grass? (b) What force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) Draw a sketch of the situation showing the system of interest used to solve each part. For this situation, draw a free-body diagram and write the net force equation.A horizontal force Fa = 100 N pushes two blocks up a frictionless 30?? incline,as shown. The masses are m1 = 10.0 kg and m2 = 4.00 kg..a) What is the acceleration of the blocks?b) What is the magnitude of the contact force between m1 and m2 ?s The giant Pacific octopus (Enteroctopus dofleini) has a typical mass of 15 kg and can propel itself bymeans of a water jet when frightened. (a) If it expels water at amass rate of 2.4 kg>s and with a speed of 27 m>s, what thrust canit generate? (b) If the seawater exerts a resistive force of 18 N onthe octopus, what acceleration can it achieve? (c) If the octopusmaintains its jet propulsion for 3.0 s, what maximum velocitycan it attain?
- A 20,000 kg rocket has a rocket motor that generates 3.0 x 105 N of thrust.a. What is the rocket’s initial upward acceleration?b. At an altitude of 5.0 km the rocket’s acceleration hasincreased to 6.0 m/s2. What mass of fuel has it burned?A 4.95 * 105 -kg rocket is accelerating straight up. It's engines produce 1.4 * 107 N of thrust, and air resistance is 4.55 * 106N.Considering the variables below:m =4.95*105 -kg f = 1.4 * 107 N fr=4.55*106 N What would be rockets acceleration, using a coordinates system where up is positive?Keith Lee, who is billed at 154 kg, ejects Adam Cole, billed at 95 kg, from frame. Assuming Cole comes to a complete stop before being yeeted, what is the net force he feels if he travels 2 m in 0.65 s? A. 1,458 N B. 450 N C. 900 N
- A 0.51 kg football is thrown with a velocityof 18 m/s to the right. A stationary receivercatches the ball and brings it to rest in 0.020s.What is the force exerted on the receiver?Answer in units of N.If the rocket sled starts with only onw rocket burning, what is the magnitute of its acceleration. Assume that the mass of the system is 2.50x10^3 kg, the thrust F=2.10x10^4N and the force of friction opposing the motion is known to be f=665N. a. What is the magnitude of its acceleration?The human head can be considered as a3.3-kg cranium protecting a 1.5-kg brain, with a small amount ofcerebrospinal fluid that allows the brain to move a little bit insidethe cranium. Suppose a cranium at rest is subjected to a force of2800 N for 6.5 ms in the forward direction. (a) What is the finalspeed of the cranium? (b) The back of the cranium then collideswith the back of the brain, which is still at rest, and the two movetogether. What is their final speed? (c) The cranium now hits anexternal object and suddenly comes to rest, but the brain continues to move forward. If the front of the brain interacts with thefront of the cranium over a period of 15 ms before coming to rest,what average force is exerted on the brain by the cranium?
- Two blocks are attached by massless strings and accelerated to the right on a frictionless horizontal surface by TB. The masses are m1 = 2.0 kg and m2 = 3.0 kg. The acceleration of the block 1 is 5.0 m/s2. Match the answers with questions.Three blocks on a frictionless surface are connected by massless strings, with M1M1 = 1.59 kg, M2M2 = 2.37 kg, and M3M3 = 3.91 kg. Due to the force F acting on M3M3, as shown, the system accelerates to the right. Given that T1T1 = 4 N, find the acceleration of block 1.? If the string stays taut, what is the acceleration of block 2? What is T2T2?A brave but inadequate rugby player is being pushedbackward by an opposing player who is exerting a force of800 N on him. The mass of the losing player plus equipmentis 90.0 kg, and he is accelerating at 1.20 m/s2backward.(a) What is the force of friction between the losing player’sfeet and the grass? (b) What force does the winning playerexert on the ground to move forward if his mass plusequipment is 110 kg? (c) Draw a sketch of the situationshowing the system of interest used to solve each part. Forthis situation, draw a free-body diagram and write the netforce equation