Answer:
Explanation:
m = Mass of person = 70 kg
c = Specific heat of human body =
= Change in temperature
Time taken is 1 hour
Heat is given by
The rise in temperature is
Answer:
B. point on the surface directly above the earthquake
Explanation:
The earthquake involves the propagation of waves through the inner part of the earth due to natural or artificial processes. This majorly leads to the vibration of the earth crust of the affected region as the waves propagates. Thereby, causing sometimes the a violent break up of the surface of the earth from within.
Therefore, the focus of an earthquake is majorly called its epicenter, which is a point on the surface directly above the earthquake itself.
== You're pushing the load <u><em>straight</em></u> along the horizontal surface at a <u><em>constant speed</em></u>.
== The speed and direction of the load are not changing, so there is <u><em>no acceleration.</em></u>
== From Newton's 2nd law of motion, we know that F = m A . Since A=0, F must also be zero. That means <em>NO NET FORCE</em> is acting on the load.
== But how can that be ? You're pushing it with 90 N !
== The NET force is zero. So something else must be pushing the box, also with <em>90 N of force, exactly opposite to YOUR force, </em>and they add up to zero.
== THERE's your force of friction !
A. The efficiency of the ramp is 54.6 %.
<h3>Velocity ratio of the ramp</h3>
V.R = distance moved by effort/distance moved by load = L/h
V.R = (6.12)/(1.53) = 4
<h3>Mechanical advantage of the ramp</h3>
M.A = Load/Effort
M.A = (451 x 9.8)/(2025)
M.A = 2.183
<h3>Efficiency of the ramp</h3>
E = (M.A / V.R) x 100%
E = (2.183 / 4) x 100%
E = 54.6 %
Thus, the efficiency of the ramp is 54.6 %.
Learn more about efficiency here: brainly.com/question/15418098
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That depends on what the sound is traveling through, and the density
and temperature of the substance.
In dry air, at sea-level pressure and 68° F, the speed of sound is
about 340 meters per second (761 miles per hour).