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4 years ago

Micah knows that a car had a change in velocity of 15 m/s. To determine acceleration, Micah also needs the_______________

Physics

2 answers:

Andrej [43]4 years ago

6 0

Answer: Time

Explanation: Took the test and got it right! :)

Tomtit [17]4 years ago

5 0

Answer:

Duration of the total trip

Explanation:

Acceleration is defined as the rate of change of velocity of an object:

$a=\frac{\Delta v}{\Delta t}$

where

$\Delta v$ is the change in velocity

$\Delta t$ is the duration of the change in velocity

Acceleration is measured in meters per squared seconds, $m/s^2$ . Also, we should note that acceleration is a vector quantity, so in order to completely define acceleration we also need to specify the direction.

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At the same temperature, two wires made of pure copper have different resistances. The same voltage is applied at the ends of ea

Semmy [17]

Answer:

Explanation:

As we know that the resistance of the wire is directly proportional to the length of wire and inversely proportional to the area of crossection of the wire.

As the material is copper for both the wires so the resistivity is same and the voltage is also same. As their resistance is different it means either length is different or the area of crossection is different.

6 0

3 years ago

The current in the wires of a circuit is 180.0 milliamps. If the resistance of the circuit were doubled ( with no change in volt

Troyanec [42]

Answer:

I = 0.09[amp] or 90 [milliamps]

Explanation:

To solve this problem we must use ohm's law, which tells us that the voltage is equal to the product of the voltage by the current.

V = I*R

where:

V = voltage [V]

I = current [amp]

R = resistance [ohm]

Now, we replace the values of the first current into the equation

V = 180*10^-3 * R

V = 0.18*R (1)

Then we have that the resistance is doubled so we have this new equation:

V = I*(2R) (2)

The voltage remains constant therefore 1 and 2 are equals and we can obtain the current value.

V = V

0.18*R = I*2*R

I = 0.09[amp] or 90 [milliamps]

7 0

3 years ago

What does acceleration mean?

max2010maxim [7]

Acceleration occurs when velocities change.velocity changes either because the speed changes or the direction change.

8 0

3 years ago

Heat transfers energy from a hot object to a cold object. Both objects are isolated from their surroundings. The change in entro

aniked [119]

To develop this problem we will start from the definition of entropy as a function of total heat, temperature. This definition is mathematically described as

$S = \frac{Q}{T}$

Here,

Q = Total Heat

T = Temperature

The total change of entropy from a cold object to a hot object is given by the relationship,

$\Delta S = \frac{Q}{T_{cold}}-\frac{Q}{T_{hot}}$

From this relationship we can realize that the change in entropy by the second law of thermodynamics will be positive. Therefore the temperature in the hot body will be higher than that of the cold body, this implies that this term will be smaller than the first, and in other words it would imply that the magnitude of the entropy 'of the hot body' will always be less than the entropy 'cold body'

Change in entropy $\Delta S_{hot}$ is smaller than $\Delta S_{cold}$

Therefore the correct answer is C. Will always have a smaller magnitude than the change in entropy of the cold object

5 0

3 years ago

After asking a question, a scientist can form a(n) , which is an idea that may be proved or disproved by an experiment.

DochEvi [55]

Answer:

When scientists have a question, they form a hypothesis, which is an idea that may be proved or disproved by an experiment.

6 0

3 years ago

Read 2 more answers