Which of the following statements is true of stars?
A) They die when they exhaust their fuel, allowing gravity to take control.
B) The energy generated through nuclear fusion keeps their interiors cool.
C) They avoid collapsing by balancing gravity through low pressures.
D) The generation of energy from nuclear fusion prevents stars from resisting their own gravity.
A
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A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3 m/s2. (a) Determine the mass of the block
(b) Calculate the distance the block will travel is the force is applied for 10 s. (c) Calculate the speed of the block after the force has been applied for 10 s.
In a two-slit experiment, there are 11 bright fringes within the central diffraction maximum. What is the ratio of the slit width to the slit separation?
A. 5 B. 1/6 C. 1/5 D. 6
A myopic (nearsighted) dancer wears eyeglasses that allow him to have clear distant vision. The power of the lenses of his eyeglasses is -3.00 diopters. Without eyeglasses, what is the far point of the dancer?
A) 0.50 m B) 0.17 m C) 0.42 m D) 0.33 m E) 0.25 m
A mass src="https://sciemce.com/media/4/bf4b81cac39c602934.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless horizontal surface as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If 
is 1.00 kg, 
is 2.00 kg, and M is 4.00 kg, then what is the acceleration of
A. 1.55 
B. 1.96
C. 2.06
D. 2.33
E. 2.72