The fulcrum of a first-class lever divides its 9.0 m arm into two sections—a 6.0 m arm and a 3.0 m arm. you place a rock weighing 98.1 n on the 3.0 m end. how much force do you need to exert on the 6.0 end to balance the lever?

a)49 n
b)200 n
c)880 n
d)1,800 n

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

The heliocentric and the geocentric models of the solar system included these central principles