Answer:
Explanation:
Do time divided by miles
36/72 = 0.5
That means for every mile 0.5 seconds is ran
that's pretty fast :)
Answer:
1.8 MJ
Explanation:
PE = mgh
PE = (1500 kg) (3.7 N/kg) (324 m)
PE = 1,798,200 J
PE = 1.8 MJ
Answer:
B
Explanation:
Answer: h =1.22 m
Explanation:
from the question we were given the following
mass of performer ( M1 ) = 77 kg
length of cable ( R ) = 3.65 m
mass of costar ( M2 ) = 55 kg
maximum height (h) = ?
acceleration due to gravity (g) = 9.8 m/s^2 (constant value)
We first have to find the velocity of the performer. From the work energy theorem work done = change in kinetic energy
work done = 1/2 x mass x ( (final velocity)^2 - (initial velocity)^2 )
initial velocity is zero in this case because the performer was at rest before swinging, therefore
work done = 1/2 x 77 x ( v^2 - 0)
work done = 38.5 x ( v^2 ) ......equation 1
work done is also equal to m x g x distance ( the distance in this case is the length of the rope), hence equating the two equations we have
m x g x R = 38.5 x ( v^2 )
77 x 9.8 x 3.65 = 38.5 x ( v^2 )
2754.29 = 38.5 x ( v^2 )
( v^2 ) = 71.54
v = 8.4 m/s ( velocity of the performer)
After swinging, the performer picks up his costar and they move together, therefore we can apply the conservation of momentum formula which is
initial momentum of performer (P1) + initial momentum of costar (P2) = final momentum of costar and performer after pick up (Pf)
momentum = mass x velocity thereforethe equation above now becomes
(77 x 8.4) + (55 x 0) = (77 +55) x Vf
take note the the initial velocity of the costar is 0 before pick up because he is at rest
651.3 = 132 x Vf
Vf = 4.9 m/s
the performer and his costar is 4.9 m/s after pickup
to finally get their height we can use the energy conservation equation for from after pickup to their maximum height. Take note that their velocity at maximum height is 0
initial Kinetic energy + Initial potential energy = Final potential energy + Final Kinetic energy
where
kinetic energy = 1/2 x m x v^2
potential energy = m x g x h
after pickup they both will have kinetic energy and no potential energy, while at maximum height they will have potential energy and no kinetic energy. Therefore the equation now becomes
initial kinetic energy = final potential energy
(1/2 x (55 + 77) x 4.9^2) + 0 = ( (55 + 77) x 9.8 x h) + 0
1584.7 = 1293 x h
h =1.22 m
b. radiation.
c. conduction.
d. density.
Heattransfer within a fluid takes place by convectioncurrents. The correct option is a.
Convection currents are principally responsible for heat transmission within a fluid. Heat is transferred through the fluid's own movement through convection.
Heat causes a fluid's particles to gain energy and lose density, which causes them to rise. Heat energy is carried upward by the heated fluid.
A cycle of circulationresults from the movement of colder fluid from the surroundings into its place in the interim.
Through this mechanism, heat can be moved from hotter to cooler areas of the fluid. Convectioncurrents are frequently seen in fluids like air and liquids, and they're important for both engineering and a variety of natural occurrences.
Thus, the correct option is a.
For more details regarding Convection currents, visit:
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Answer:
the answer is A. convection currents
Explanation:Convection currents transfer heat from one place to another by mass motion of a fluid such as water, air or molten rock. The heat transfer function of convection currents drives the earth’s ocean currents, atmospheric weather and geology. Convection is different from conduction, which is a transfer of heat between substances in direct contact with each other.
hopes this helps yall