An Atwood machine consists of a mass of 3.5 kg connected by a light string to a mass of 6.0 kg over a frictionless pulley with a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm
If the system is released from rest, what is the speed of the masses after they have moved through 1.25 m if the string does not slip on the pulley? A) 2.0 m/s
B) 2.3 m/s
C) 4.0 m/s
D) 5.0 m/s
E) 6.0 m/s
B
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A deep space probe moving forward in space needs to make a course correction and so fires a thruster on the side of the probe 90° away from its direction of motion, as shown below. This thruster, while on, exerts a constant force on the probe perpendicular to its original direction of motion. While the thruster is operating, which trajectory best describes the probe’s motion? (Hint: Note that the thrust force delivers an upward impulse to the probe during every successive time interval. Consider what happens to the ball in figure C2.4 as it receives analogous continual downward impulses.)
A. A
B. B
C. C
D. D
E. E
What is the approximate range in latitude over which sunspots appear?
What will be an ideal response?
According to Newton’s 2nd Law
A. If the force is doubled and the mass remains the same the acceleration will halve. B. If the force is doubled and the mass remains the same the acceleration will double. C. If the force is doubled and the mass remains the same the acceleration will increase by a factor of 4. D. If the force is doubled and the mass remains the same the acceleration will decrease by one-fourth.
Changes that alter the chemical composition of a substance are known as ______________ changes
Fill in the blank(s) with correct word