A man carries a 10 kg ball at waist level and walks for 8 meters. How much work does the man do against gravity while walking?

How much heat is required to convert 0.3 kg of ice at 0°c to water at the same temperature

The optimistic view of human nature held by supporters of the humanistic perspective led to more positive views of human nature throughout the field of psychology. t or f?

Abaseball has a mass of 0.145 kg and approaches a bat at 40.0 m/s. after it is hit, the ball leaves the bat at 50.0 m/s directly back. find the impulse of the bat on the ball. 7.25 kg*m/s 13.1 kg*m/s 5.80 kg*m/s 1.45 kg*m/s