Physics, 23.03.2021 04:00, ldestl

Archimedes is supposed to have said, “Give me a place to stand on and I will move the Earth.” While in principle the claim is valid, the prob-
lems of testing it are vast. Consider the following, highly unrealistic
conditions. Suppose you had a mass equal to that of the Earth—5.98 X
1024 kg—and that it rests on one end of a lever that is balanced on a
fulcrum. The fulcrum is placed on a vast, flat surface in a gravitational
field equal to that at Earth's surface. Let Earth be placed 1.00 m from
the fulcrum, while the distance from the fulcrum to the applied force is
3.8 x 1016 m, or the approximate distance from the sun to the next
closest star. How large must the applied force be to balance the Earth's
weight? How large is the upward force exerted by the fulcrum on the
lever? Assume the lever to be massless.

Answers: 2

Show answers

Other questions on the subject: Physics

Physics, 22.06.2019 00:10, oktacos

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

Answers: 3

continue

Physics, 22.06.2019 12:30, mommer2019

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

Answers: 1

continue

Physics, 22.06.2019 18:50, rurbanok12

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.

Answers: 3

continue

Physics, 22.06.2019 21:50, nathaniel12

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.

Answers: 3

continue

Do you know the correct answer?

Archimedes is supposed to have said, “Give me a place to stand on and I will move the Earth.” While...