Answer:
reaches a higher temperature is LEAD.
Explanation:
In this exercise we have a calorimeter problem, in which the initial energy is absorbed by each body
E₀ = m c_e ΔT
where E₀ = 5000 J
ΔT =
the specific heats for each material are tabulated
material c_e (J / kg ºC)
glass 837
copper 387
lead 128
gold 129
As they indicate that the mass of the materials is the same, the one with the greatest temperature difference is the one with the least specific heat, consequently the one that reaches a higher temperature is LEAD.
let's calculate for a mass of 1 kg
glass
ΔT = 5000/(1 837)
ΔT = 6ºC
Lead
ΔT = 5000/(1 128)
ΔT = 39.1º
GOLD
ΔT = 5000/(1 129)
ΔT = 38.8º C
Answer:
(a) the runner's kinetic energy at the given instant is 308 J
(b) the kinetic energy increased by a factor of 4.
Explanation:
Given;
mass of the runner, m = 64.1 kg
speed of the runner, u = 3.10 m/s
(a) the kinetic energy of the runner at this instant is calculated as;
(b) when the runner doubles his speed, his final kinetic energy is calculated as;
the change in the kinetic energy is calculated as;
Thus, the kinetic energy increased by a factor of 4.
The final velocity of the 14 kg object is 1.6 m/s in the same direction
Explanation:
We can solve this problem by using the law of conservation of momentum: the total momentum of the system must be conserved before and after the collision. Therefore, we can write
where:
is the mass of the first object
is the initial velocity of the first object
is the final velocity of the first object
is the mass of the second object
is the initial velocity of the second object
is the final velocity of the second object
Re-arranging the equation and substituting the values, we find:
And the direction is the same as the initial direction, since it has the same sign.
Learn more about conservation of momentum:
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