The last on on the image :-)
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:
24
Explanation:
24.305 of atomic mass has 12 neutrons
Answer:
Waves of energy traveling through a space
Explanation:
Answer:
1. high, low
2. decreasing, increasing
3. low, high
4. kinetic, thermal
Explanation:
When the boy is skating, he has kinetic energy. As he slows, the kinetic energy is being converted to thermal energy. When he stops, all the kinetic energy has been converted to thermal energy. At all times, the total energy is the sum of kinetic and thermal energies.
