In a block and tackle, some friction in the pulleys will reduce the mechanical advantage of the machine. To include friction in a calculation of the mechanical advantage of a block and tackle, divide the weight of the object being lifted by the weight necessary to lift it.
Hope this helps
Answer:
Explanation:
Given
volume 
Suppose base is square with side L
height of crate is h
Volume 
Cost of top and bottom area 
Cost of Side area 
Total Cost 
Total Cost 
Differentiate C w.r.t Length
Dimensions are 
Answer:
See below
Explanation:
Each resistor has 6 v applied across it
rememeber
V = IR then V/R = I
f<u>or the 6 Ω 6 v /6Ω = 1 amp</u>
<u>for the 3 Ω 6v /3Ω = 2 amp</u>
Answer:
Explanation:
The Work-Kinetic Energy Theorem states that the work done on a particle of mass "m", equals the particle's change in Kinetic Energy (final Kinetic Energy of the particle "
" minus the initial Kinetic energy of the particle "
"), and it is expressed as:
where we have used the explicit form of the KE of a particle of mass m and velocity 
. Of course, 
stands for the final velocity of the particle, and 
for the particle's initial velocity.
Answer:
95 minutes
Explanation:
According to N.A.S.A, the Hubble Space Telescope makes one orbit around Earth every 95 minutes.
"The Hubble Space Telescope is a large telescope in space. It was launched into orbit by space shuttle Discovery on April 24, 1990. Hubble orbits about 547 kilometers (340 miles) above Earth. It is the length of a large school bus and weighs as much as two adult elephants. Hubble travels about 5 miles per second: That is like traveling from the eastern coast of the United States to the western coast in 10 minutes. Hubble is solar-powered.
Hubble takes sharp pictures of objects in the sky such as planets, stars and galaxies. Hubble has made more than one million observations. These include detailed pictures of the birth and death of stars, galaxies billions of light years away, and comet pieces crashing into Jupiter's atmosphere.
Scientists have learned a lot about the universe from these pictures. Many of them are beautiful to look at."
