An 1100-kg car traveling at 27.0 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?
A) 690 N
B) 550 N
C) 410 N
D) 340 N
A
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What of the following most directly determines how much fuel a star has?
A. its density B. its temperature C. its speed of rotation D. its luminosity E. its mass
A box is moved 10 m across a smooth floor by a force F making a downward angle with the floor, so that there is effectively a 4 N force acting parallel to the floor in the direction of motion and a 3 N force acting perpendicular to the floor. The force F acts for 20 seconds. The impulse delivered to the box by the floor during this process has magnitude
A. 60 Ns. B. zero. C. 100 Ns. D. 80 Ns. E. Can't tell without knowing the weight of the box
In order for organic molecules to have formed on the early Earth, what do we know could not have been present in the atmosphere in significant quantities?
A) oxygen (O2) B) nitrogen (N2) C) carbon dioxide (CO2) D) argon (Ar)
The planet Neptune was discovered by perturbations of
A) Uranus. B) its moons. C) Pluto. D) none of the above