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2 years ago

5

The law of conservation of mass states that in a chemical reaction matter is not created or destroyed true or false

1 answer:

lisov135 [29]2 years ago

4 0

True it only changes form. Like when water evaporates goes from liquid to a gas and is not destroyed.

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A freezer has a coefficient of performance of 4.1. You place 0.45 kg of water at 16°C in the freezer, which maintains its temper

velikii [3]

Ohh this is quite a lot umm i’ll be back hold on

5 0

2 years ago

How do you know this stuff

polet [3.4K]

Some people just know it. Do you have a question?

3 0

2 years ago

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An astronaut holds a rock 100 m above surface of Planet X. The rock is then thrown upwards with a sleek of 15m/s. The rock reach

Gelneren [198K]

Answer: $5 m/s^{2}$

Explanation:

This problem is related to vertical motion, and the equation that models it is:

$y=y_{o}+V_{o}sin\theta t-\frac{1}{2}gt^{2}$ (1)

Where:

$y=0m$ is the rock's final height

$y_{o}=100 m$ is the rock's initial height

$V_{o}=15 m/s$ is the rock's initial velocity

$\theta=90\°$ is the angle at which the rock was thrown (directly upwards)

$t=10 s$ is the time

$g$ is the acceleration due gravity in Planet X

Isolating $g$ and taking into account $sin(90\°)=1$ :

$g=(-\frac{2}{t^{2}})(y-y_{o}-V_{o}t)$ (2)

$g=(-\frac{2}{(10 s)^{2}})(0 m-100 m-(15 m/s)(10 s))$ (3)

$g=5 m/s^{2}$ (4) This is the acceleration due gravity in Planet X

5 0

2 years ago

This will have to do with that which statement describes seismic waves?

AURORKA [14]

Answer:

an elastic wave in the earth produced by an earthquake or other means

Explanation:

3 0

2 years ago

Read 2 more answers

An 11.0-W energy-efficient fluorescent lightbulb is designed to produce the same illumination as a conventional 40.0-W incandesc

mario62 [17]

Answer:

$Savings = $0.709$

Explanation:

Energy consumed by 11 W energy efficient fluorescent bulb is given as

$E = Power \times time$

now we can say

$E = 11 \times 220h$

$E = 2.42 kWh$

now total cost of the energy used is given as

$Amount = 2.42 \times $0.111$

$Amount = $0.268$

Now for conventional 40 W bulb we can say

$E = Power \times time$

now we can say

$E = 40.0 \times 220h$

$E = 8.8 kWh$

now total cost of the energy used is given as

$Amount = 8.8 \times $0.111$

$Amount = $0.977$

So total money saving is given as

$Savings = $0.977 - $0.268$

$Savings = $0.709$

5 0

2 years ago