A person holds a 4.0 kg block at position A, 30 cm above ground, in contact with an uncompressed vertical spring with a spring constant of 500 N/m. the person gently lowers the block from rest at position A to rest at position B. which of the following describes the change in the energy of the block-spring-Earth system as a result of the block being lowered?
(a) The energy decreases by approx. 1.5 J
(b) The energy decreases by approx. 2.5 J
(c) The energy increases by approx. 4.0 J
(d) The energy of the system does not change.

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.

When conducting an investigation to determine which type of fertilizer produces the most flowers on a plant, which variable would be graphed on the x-axis once you collected the data? a. type of fertilizer b. amount of flowers c. amount of water d. number of days that the plants grew

On a hot saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 22degreesc. at noon the air conditioner is turned off, and the people go home. the temperature outside is a constant 33degreesc for the rest of the afternoon. if the time constant for the building is 4 hr, what will be the temperature inside the building at 4 : 00 font size decreased by 2 upper p . font size decreased by 2 upper m .? at 6 : 00 font size decreased by 2 upper p . font size decreased by 2 upper m .? when will the temperature inside the building reach 24degreesc? 324281