Discuss similarities and differences between KINETIC ENERGY and MOMENTUM
What will be an ideal response?
K is a scalar whereas P is a vector. Both depend upon mass and speed, however K depends upon the square of the speed but P is simply proportional to velocity. Momentum is always conserved for an isolated system, but K might change if it changes to/from other energy forms.
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A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is above the ground. What is the mass of the box?
A) 8.9 kg B) 5.3 kg C) 6.7 kg D) 8.0 kg
A uniform beam having a mass of 60 kg and a length of 2.8 m is held in place at its lower end by a pin. Its upper end leans against a vertical frictionless wall as shown in the figure. What is the magnitude of the force the pin exerts on the beam?
a.
0.68 kN
b.
0.57 kN
c.
0.74 kN
d.
0.63 kN
e.
0.35 kN
Why is it that the quasars we see represent a time when the universe was younger?
What will be an ideal response?
Three galaxies, each of mass m = 4.0 × 1041 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0 × 1022 m length. The magnitude of the force the other two galaxies exert on each galaxy is
A. 4.3 × 1027 N. B. 6.4 × 1027 N. C. 7.4 × 1027 N. D. 8.6 × 1027 N. E. 4.3 × 1028 N.