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3 years ago

Can anybody help with this GCSE physics question?

Physics

1 answer:

Serjik [45]3 years ago

8 0

Answer:

$volume = 18.45 \times 18.45 \times 18.45 \\ = 0.00000628 \: {m}^{3} \\ mass = density \times volume \\ = 8.0 \times {10}^{3} \times 0.00000628 \\ = 0.05\: kg$

$\small \boxed{ \boxed { becker}}$

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A reaction taking place in a container with a piston-cylinder assembly absorbs 4850. J of heat and has a change in the internal

Maslowich

Answer:

$V_f = 16.3 Ltr$

Explanation:

As per first law of thermodynamics we know that

heat absorbed = change in internal energy + Work done

so we have

$Heat = 4850 J$

$\Delta U = 1618.5 J$

so work done is given as

$4850 = 1618.5 + W$

$W = 3231.5 J$

now we know that at constant pressure the work done is given as

$W = P\Delta V$

$3231.5 = P(V_f - V_i)$

$3231.5 = 5.5 \times 1.01 \times 10^5(V_f - 10.5 \times 10^{-3})$

$V_f = 16.3 \times 10^{-3} m^3$

or we have

$V_f = 16.3 Ltr$

6 0

3 years ago

A 5 kg

kotykmax [81]

Answer:

The object-Earth system is open

$F_n=ma=5\ (7.2)=36\ N$

Explanation:

Accelerated Motion

When an object is released in free air (with no other forces than the gravity), it describes a free-fall motion and the formulas include the acceleration of gravity as part of the calculations. But when there is another external force, then the acceleration is not the gravity, but the result of the net force exerted on the mass of the object.

By definition, an open system includes the exchange of energy from and to the surroundings, that is why all systems surrounding our planet are considered as open systems. In our case, the object is interacting with the planet's gravity and there is some other external force, which will be computed later. The object-Earth system is open.

If the object starts from rest, its initial speed is zero, and

$v_f=a\ t$