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lorasvet [3.4K]
3 years ago
6

Chemists measure energy in units of _________ because it is based on heating water. Since most chemical reactions are doing in w

ater or surrounded by water, this is an easy way to measure the energy change during a reaction.
A work
B Joule
C Calorie
D Horsepower
Physics
1 answer:
Kobotan [32]3 years ago
6 0

The answer is; C

A calorie is  a unit of energy used to describe the energy required to raise the temperature of one gram of water by one degree at an ambient pressure of 1 atmosphere. This SI unit has gained popularity in its use in nutrition where the energy in a particular type of food (carbohydrates, proteins, and fats) is measured in calories.


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For the circuit in the previous part, with the frequency set at 1 hz, what happens if the inductance of the inductor is increase
lubasha [3.4K]
The relationship between inductance and frequency can be clearly described using the following equation of inductive reactance:

Xl = 2*pi*f*L ; simplifying:

L = Xl / 2*pi*f

Therefore, as what we saw, inductance and frequency are inversely proportional. To add up, when inductance increases the frequency would decrease.
7 0
3 years ago
Which type of friction force acts when there is no motion?
rosijanka [135]
Its called static friction.
3 0
3 years ago
A woman on a bridge 95.6 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an a
NARA [144]

Answer:

The speed of the raft is 1.05 m/s

Explanation:

The equation for the position of the stone is as follows:

y = y0 + v0 · t + 1/2 · g · t²

Where:

y = height of the stone at time t

y0 = initial height

v0 = initial speed

t = time

g = acceleration due to gravity

The equation for the position of the raft is as follows:

x = x0 + v · t

Where:

x = position of the raft at time t

x0 = initial position

v = velocity

t = time

To find the speed of the raft, we have to know how much time the raft traveled until the stone reached the river. For that, we can calculate the time of free fall of the stone:

y = y0 + v0 · t + 1/2 · g · t²      (v0=0 because the stone is dropped from rest)

If we place the origin of the frame of reference at the river below the bridge:

0 m = 95.6 m - 9.8 m/s² · t²

-95.6 m / -9,8 m/s² = t²

t = 3.12 s

We know that the raft traveled (4.84 m - 1.56 m) 3.28 m in that time, then the velocity of the raft will be:

x/t = v

3.28 m / 3.12 s = v

v = 1.05 m/s

5 0
2 years ago
Read 2 more answers
Two capacitors with capacitances of 3.25 and 5.00 μF, respectively, are connected in parallel. The system is connected to a 55-V
Nataliya [291]

The charge accumulated in 3.25 μF capacitor is 178.75 μC.

Answer:

Explanation:

In parallel connection, the voltage drop across any passive devices like capacitor or resistor will be constant. So the current flow will be varying in case of parallel connections of capacitors or resistors.

As the capacitance is the measure of amount of charge or current generated for a given amount of voltage, it is directly proportional to the charge or current and inversely proportional to voltage.

C = Q/V

Here the charge accumulated in a capacitor of capacitance 3.25 microfarad need to be determined which is in parallel connection with another capacitor. So the voltage through both the capacitor will be equal to the voltage of the battery which is stated as 55 V.

3.25×10^{-6} = Q/55

Q = 3.25 * 55 = 178.75 μC

So the charge accumulated in 3.25 μF capacitor is 178.75 μC.

7 0
3 years ago
Oersted found the direction of the magnetic field around a wire carrying current by placing a (fill in the blank)
jolli1 [7]

Answer: he used a compass to find the direction of the magnetic field

3 0
2 years ago
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