A mass of 4.5 kg, resting on a horizontal frictionless surface, is attached on the right to a horizontal spring with spring constant 29 N/m and on the left to a horizontal spring with spring constant 60 N/m. If this system is moved from equilibrium, what is the effective spring constant?
a. –31 N/m
b. 31 N/m
c. 89 N/m
d. –89 N/m
e. 16 N/m
c
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A mass src="https://sciemce.com/media/4/1ae955860995e84634.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
as shown in the figure. Both masses move vertically and there is no slippage between the string and the pulley. The pulley has a radius of 20.0 cm and a moment of inertia of 1?2 
If 
is 3.00 kg, 
is 6.00 kg and M is 4.00 kg, then what is the tension in the string that is attached to mass
A. 20.8 N
B. 27.4 N
C. 30.2 N
D. 37.4 N
E. 43.5 N
In order for a force to do no work on an object
A. All forces must do work. B. The object is stationary, or the force is perpendicular to the motion C. The force is perpendicular to the direction of motion D. The object is stationary
What is the cause of a magnetic field about a permanent magnet and about a current-carrying wire?
What will be an ideal response?
A spaceship moving past the Earth with a speed of 0.800 c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
a. 13.4 s b. 16.7 s c. 12.5 s d. 9.70 s e. 6.03 s