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nignag [31]
3 years ago
15

How much energy must the brakes absorb to bring a 1200kg car from 30m/s to 15 m/s?

Physics
1 answer:
gregori [183]3 years ago
7 0
34 credits from karma make more answer
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Two point charges are separated by 6 cm. The attractive force between them is 20 N. Find the force between them when they are se
Scorpion4ik [409]

Answer:

5 N

Explanation:

F_1 = 20 N

r_1 = 6 cm

r_2 = 12 cm

k = Coulomb constat

q = Charge

\dfrac{F_1}{F_2}=\dfrac{\dfrac{kq_1q_2}{r_1^2}}{\dfrac{kq_2q_2}{r_2^2}}\\\Rightarrow \dfrac{F_1}{F_2}=\dfrac{r_2^2}{r_1^2}\\\Rightarrow \dfrac{F_1}{F_2}=\dfrac{12^2}{6^2}\\\Rightarrow \dfrac{F_1}{F_2}=4\\\Rightarrow F_2=\dfrac{F_1}{4}\\\Rightarrow F_2=\dfrac{20}{4}\\\Rightarrow F_2=5\ N

The force is 5 N

7 0
3 years ago
How does size influence the appearance of a star? Give an example in your response.
vlabodo [156]
The size of the star defines wither of not it is a dwarf star, or a red giant.
5 0
4 years ago
A blender with a total resistance of 6 ohms runs on a voltage of 190 volts. How much current does it use? NEED TO KNOW ASAP PLEA
faltersainse [42]
<h2>Hello!</h2>

The answer is 31.67 Amps.

<h2>Why?</h2>

To solve the problem, we need to use Ohm's Law equation, which states that:

V=IR

Where,

V, is the voltage (in volts)

I, is the current (in Amps)

R, is the resistance (in Ohms)

We are given the following information:

Voltage=190v\\Resistance=6\Omega\\

So, using Ohm's Law equation and substituting the given information, we have:

V=IR\\\\190v=I*6\Omega\\\\I=\frac{190v}{6\Omega}=31.67Amps

Hence, we have that the current used by the blender is 31.67Amps.

Have a nice day!

4 0
3 years ago
Whats the difference between independent and dependent variables? also, theory and hypothesis?
svlad2 [7]
Independent variable: the variable in an experiment which value is not changed based on any other variable. often denoted by "x"
dependent variable: the variable in an experiment which changes based on the value of the independent variable, ie how much of it you use, how often you use it, etc. often denoted by "y"

theory: an explanation as to why certain phenomena occur. supported and testable, but could change with new research / experiments, etc.
hypothesis: a guess or an estimate of what will happen during an experiment. testable, and may be wrong.

i hope this helps!!
7 0
3 years ago
If you put a cup of hot chocolate at 90c on a table in a room kept at 25c you know it will cool down. How cool will the hot choc
bagirrra123 [75]

Answer:

Explanation:

Assuming we have a two hot liquid like 70°C tea and 30°C water, the tea will cool down but not to 30°C but to an equilibrium temperature say 40°C

But in this case, the temperature of the chocolate will drop almost to the room temperature eventually,

The heat in the chocolate will even out into the room temperature and the room will get slightly warmer until the are both in equilibrium temperature. But you won't notice this little change but if you go out of the room, you might notice that change...

So this little fraction is not always notice, so we will still considered it as the room temperature

7 0
3 years ago
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