Please ignore the writing and provide a step by step aproach to solving. Typing
ID: 1313242 • Letter: P
Question
Please ignore the writing and provide a step by step aproach to solving. Typing it out is prefered!
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An egg falls from a bird's nest in a tree and feels no effects due to the air. As it falls, only its momentum is conserved. only its kinetic energy is conserved. both its mechanical energy and its momentum are conserved, both its kinetic energy and its momentum are conserved. only its mechanical energy is conserved. Spaceman Speff orbits planet X with his spaceship. To remain in orbit at 172 km from the planet's center, he should maintain a speed of 28 m/s. What is the mass of planet X? 0.7 Times 1014 kg 0.7 Times 1071 kg 0.20 Times 1016 kg 0.20 Times 1019 kg You do 134 J of work while pulling your sister back on a swing, whose chain is 5.10 m long, until the swing makes an angle of 32.0degree with the vertical. What is your sister's mass? 21.8 kg 15.0 kg 20.2 kg 17.6 kg The area under the curve on a Force versus time (F vs. t) graph represents impulse. work. kinetic energy. momentum. A block of mass m = 5.1 kg, moving on a frictionless surface with a speed vi = 8.0 m/s, makes a perfectly elastic collision with a block of mass M at rest. After the collision, the 5.1 kg block recoils with a speed of vf = 1.6 m/s. In Figure 8.2, the speed of the block of mass M after the collision is closest to: 9.6 m/s 6.4 m/s 8.8 m/s 7.2 m/s 8.0 m/sExplanation / Answer
20. d) only its mechanical energy is conserved.
As it falls down, its velocity goes on increasing and thus kinetic energy and momentum increases. But mechanical energy is conserved as it consists of both potential and kinetic energy.
21.d)0.2*10^19 kg.
Here, mass of the planet, M = (v^2*r)/(G) = (28^2*172*10^3)/(6.67*10^-11) = 2.02*10^18 kg = 0.2*10^19 kg.
22. d)17.6 kg
Here, Work done = mgl (1-cos(theta))
134 = m*9.8*5.10*(1-cos(32))= 17.6 kg.
24. d) impulse
23. m*vi = M.v - m*vf, thus b)6.4 m/sec