A thin copper rod that is 1.0 m long and has a mass of 0.050 kg is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to cancel the weight of the rod?
A) 1.2 A B) 7.6 A C) 2.5 A D) 4.9 A E) 9.8 A
D
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An 8.0-m massless rod is loosely pinned to a frictionless pivot at 0, as shown in the figure. A very small 4.0-kg ball is attached to the other end of the rod
The ball is held at A, where the rod makes a 30° angle above the horizontal, and is released. The ball-rod assembly then swings freely with negligible friction in a vertical circle between A and B. The tension in the rod when the ball passes through the lowest point at D is closest to A) 160 N. B) 200 N. C) 120 N. D) 80 N. E) 40 N.
Gravitational equilibrium means that the surface and the core of the Sun are at the same pressure
Indicate whether the statement is true or false
An object floats with half its volume beneath the surface of the water. The weight (force that Earth exerts in it) of the displaced water is 2000 N
What is the weight (force that Earth exerts on it) of the object? The density of water is 1000 kg/m3. A) 1000 N B) 2000 N C) 4000 N D) It cannot be determined because we do not know the volume of the object.
An automobile traveling along a straight road increases its speed from 30.0 m/s to 50.0 m/s in a distance of 180 m. If the acceleration is constant, how much time elapses while the auto moves this distance?
a. 6.00 s b. 4.50 s c. 3.60 s d. 4.00 s e. 9.00 s