The right to retain or revoke is a very strong use of a donor's power. It seems so simple but is it that simple in real life?

Please help me solve this problem. Thank you so much!

Please help me solve this problem. Thank you so much!

A spring 15 cm long extends 0.5 cm when a mass of 3 kg is hung from it. Suppose you made an similar spring of the same material, but twice as long. How much would it extend with the same mass?     0.5 cm     2 cm     1 cm     0.25 cm

Rank the following quantities of energy from largest to the smallest. State if any are equal. (a) the absolute value of the average potential energy of the SunEarth system (b) the average kinetic energy of the Earth in its orbital motion relative to the Sun (c) the absolute value of the total energy of the SunEarth system

Every so often, someone claims to have built a machine that can generate energy perpetually from nothing. Why isn't this possible according to the known laws of nature? Why do you think claims of perpetual motion machines sometimes receive substantial media attention?

4 نقاط * :An isolated system Is a specified region where transfer of energy and/or mass take place Is one in which mass within the system is not necessarily constant Is a region of constant mass and only energy is allowed to cross the boundaries Cannot transfer either energy or mass to or from the surroundings None of these answers O

How much work is required to stop an electron (m=9.11×10−31kg)(m=9.11×10−31kg) which is moving with a speed of 1.90×106 m/s ? Express your answer to three significant figures and include the appropriate units.

How much potential energy due to gravity would a person have if he is standing on top of the building that is 100 cm high? Assume that he has a mass of 100 kg.

Keep the track tilted at 13∘∘ with the horizontal. Put the friction block on the track surface at the top of the track. Let the friction block slide downwards. The length of the track is 74 cm. Starting from zero speed at the top of the track, what will be the speed of the friction block as it reaches the bottom? Write your answer in m/s. Use μμk = 0.13  and mass of the friction block = 400 grams.