Explanation:
Wind resistance is a kind of friction we usually try to minimize. It makes our cars and planes run less efficiently. At the same time though, we need friction between our tires and the road to move, as well as friction in our brakes to stop. We wouldn't be able to walk without friction, or start a campfire by rubbing sticks together.
Answer:
approximately 1.625 m/s , about 16.6% that on Earth's surface or 0.166 ɡ. Over the entire surface, the variation in gravitational acceleration is about 0.0253 m/s.
A) The friction force while the box is stationary is (the coefficient of static friction)*(the normal force). In this case, the normal force is equal to the gravitational force, or the weight. To move the box, we need a minimum horizontal force that is equal to the friction force. The weight is (500 kg)*(9.81 m/s^2)= 4905 N. So, (0.45)*(4905 N) = 2207.25 N.
b) The acceleration will be the horizontal force - the kinetic friction force (since they act in opposite directions) divided by the mass. Kinetic friction force = (coefficient of kinetic friction)*(normal force or weight).
F(net) = (2207.25 N)-(0.30)(4905 N) = 735.75 N
a = (735.75 N)/(500kg)= 1.4715 m/s^2
Answer:
Explanation:
12.)
A. Opposite poles attract
B. Same poles repel
13.)
IDK