A lever is used to lift up a 100N weight. The fulcrum is 10cm from the weight. If the effort force is applied at a distance of 50cm from the fulcrum, what is the effort force required to lift the 100N weight?

A) O N

B) 20 N

C) 50 N

D) 100 N

What absorb emitted neutrons?

Find the lengths of each of the following vectors (a) 2i + 4j + 3k (b) 5i - 2j + k (c) 2i - k (d) 5i (e) 3i - 2j - k (f) i + j + k

Light is not a wave because it does not need a medium. true or false.

If an electron is released from rest in a uniform electric field, the electric potential energy of the charge-field system does what?

Which of the following wire gage sizes is the thickest? A. 8 B. 10 C. 14 D. 0

A projectile is thrown upward so that its distance above the ground after t seconds is h (t) equals negative 16 t squared plus 704 t. a) Find the maximum height the object reaches. b) Find the time it takes the object to reach the ground.

You are standing 100 meters from an object emitting a sound of constant intensity (loudness). You walk toward the source of sound until you are 20 meters from it. From your perspective, what has happened to the intensity of the sound?

What is the peak emf generated by a 0.250 m radius, 500-turn coil is rotated one-fourth of a revolution in 4.17 ms, originally having its plane perpendicular to a uniform magnetic field. (This is 60 rev/s.)

How do credit cards use magnets to work?

Which of the following describes a physical change? A. Formation of a new substance caused by combining substances B. Water changing from liquid to gas through evaporation or boiling C. Formation of a new substance caused by application of heat