A 10.0 kg mass is moving with constant speed of 10.0 m/s.

Degger [83]

Answer: a change from one state of matter to another

Explanation: Phase change is an example of a physical change. The chemical composition does not alter during phase change. For example when ice melts its composition is still H2O but in liquid form.

8 0

4 years ago

4.5 cm3 of water is boiled at atmospheric pressure to become 4048.3 cm3 of steam, also at atmospheric pressure. Calculate the wo

Mrrafil [7]

1. 408.4 J

The work done by a gas is given by:

$W=p\Delta V$

where

p is the gas pressure

$\Delta V$ is the change in volume of the gas

In this problem,

$p=1.01\cdot 10^5 Pa$ (atmospheric pressure)

$\Delta V=4048.3 cm^3 - 4.5 cm^3 =4043.8 cm^3 = 4043.8 \cdot 10^{-6}m^3$ is the change in volume

So, the work done is

$W=(1.01\cdot 10^5 Pa)(4043.8 \cdot 10^{-6}m^3)=408.4 J$

2. 10170 J

The amount of heat added to the water to completely boil it is equal to the latent heat of vaporization:

$Q = m \lambda_v$

where

m is the mass of the water

$\lambda_v = 2.26\cdot 10^6 J/kg$ is the specific latent heat of vaporization

The initial volume of water is

$V_i = 4.5 cm^3 = 4.5\cdot 10^{-6}m^3$

and the water density is

$\rho = 1000 kg/m^3$

So the water mass is

$m=\rho V_i = (1000 kg/m^3)(4.5\cdot 10^{-6}m^3)=4.5\cdot 10^{-3}kg$

So, the amount of heat added to the water is

$Q=(4.5\cdot 10^{-3}kg)(2.26\cdot 10^6 J/kg)=10,170 J$

8 0

4 years ago

A monster truck enters a freeway with a speed of 0 m/s and accelerates at a rate of 25 m/s2 in 5 seconds. How far does the car t

Furkat [3]

Answer:

312.5

Explanation:

we know that

s= ut + 1/2 at^2

= 0*5+1/2*25*5^2

= 0+ 625/2

=312.5

plz mark as brainalist

5 0

3 years ago

How much current is drawn by a television with a resistance of 30 ω that is connected across a potential difference of 120v?

melomori [17]

By using the Ohms law, we can calculate the current.

Ohms law,

$\frac{V}{I} = R$

Here, V is potential difference, and R is the resistance.

Given, $V=120 V$ and $R = 30 ohm$ .

Therefore, putting the given values in above relation , we get

$\frac{120V}{I} = 30 ohm$

or $I=\frac{120}{30} = 4 A$

Thus, the current is drawn by a television 4 Ampere

8 0

4 years ago

a bungee jumper momentarily comes to rest at the bottom of the dive before he springs back upward. at that moment, is the bungee

barxatty [35]

Answer:

Explanation:

No, the bungee jumper is not at equilibrium.

This can be explained when we consider a bungee jumper as a mass that is undergoing simple harmonic motion. At extreme points i.e. at the bottom, the velocity of the jumper is zero but not the acceleration because it is acting in the opposite direction that is why the jumper moves upward.

3 0

3 years ago

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