Conservation of Momentum: An empty train car of mass 2.0 × 104 kg coasts along at 10 m/s. A 3000-kg boulder is suddenly dropped vertically into the car. Find the speed of the car immediately after the boulder is dropped in.
Fill in the blank(s) with the appropriate word(s).
8.7 m/s
You might also like to view...
Equilibrium: A load is being lifted vertically upwards by means of two cables attached to it. The first cable exerts a force of 600 N at an angle of 35.0° to the left of the vertical. The second cable exerts a force of 1300 N. At what angle to the right of the vertical is the second cable pulling?
A. 15.4° B. 16.2° C. 30.8° D. 67.8° E. 75.8°
Light of wavelength 425.0 nm in air falls at normal incidence on an oil film that is 850.0 nm thick. The oil is floating on a water layer 15 cm thick. The refractive index of water is 1.33, and that of the oil is 1.40
You want to add oil so that light reflected off of the top of the oil film will be canceled. What is the minimum distance that you should INCREASE the oil film? A) 60.7 nm B) 75.9 nm C) 106 nm D) 121 nm E) 152 nm
The total energy emitted by the brightest nova explosions is about:
A) 1,000 Suns. B) 50,000 Suns. C) a million Suns. D) a billion Suns. E) a trillion Suns.
A meteor shower is produced when
a. a large number of sporadic meteors are observed. b. Earth passes through the asteroid belt. c. massive particles are carried outward from the Sun by the solar wind and enter Earth's atmosphere. d. Earth passes through the orbital path of a comet. e. meteors cause condensation in the upper atmosphere that leads to early morning rains.