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Nadya [2.5K]
3 years ago
9

Which equation is used to find an object's acceleration?

Physics
1 answer:
IRINA_888 [86]3 years ago
8 0

Answer:

<em>option no. 1 </em>

Explanation:

<em>because the formula to calculate the acceration is a=final velocity- intial velocity/ time</em>

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A square coil, enclosing an area with sides 2.0 cm long, is wrapped with 2 500 turns of wire. A uniform magnetic field perpendic
Delvig [45]

Answer:

The induced voltage in the coil is 0.25 V.

Explanation:

It is given that,

Area of a square coil is 2 cm or 0.02 m

Number of turns in the wire is 2500

A uniform magnetic field perpendicular to its plane is turned on and increases to 0.25 T during an interval of 1.0 s.

We need to find the induced voltage in the coil. According to Faraday's law, the induced emf in the coil is given by the rate of change on magnetic flux. So,

\epsilon=\dfrac{-d\phi}{dt}\\\\\epsilon=\dfrac{-d(NBA)}{dt}\\\\\epsilon=NA\dfrac{-dB}{dt}\\\\\epsilon=-2500\times (0.02)^2\times \dfrac{0.25}{1}\\\\\epsilon=-0.25\ V

So, the induced voltage in the coil is 0.25 V.

3 0
3 years ago
A map of eastern North America, showing the pH of rainfall in the various states, indicates that the pH of rain in New York Stat
pogonyaev

4.22

Explanation:

The most acidic rainfall in New York State will have pH of 4.22 whereas the least acidic will be that of 4.40.

The pH scale expresses the acidity or alkalinity of aqueous solutions.

  • The pH scale ranges from 1 to 4
  • An acidic solution will have a pH value less than 7

We have given a range of values between 4.22 to 4.40

  This implies that the pH values of rainfall in this region falls between these extremes.

   The least value 4.22 is the most acidic

    The value 4.4 is the the least acidic

The lower the pH value, the more acidic a solution is.

Learn more:

pH brainly.com/question/12985875

#learnwithBrainly

6 0
3 years ago
A coffee-cup calorimeter is used to determine the heat of reaction for the reaction of compound A with compound B. A(aq) + B(aq)
Sergeeva-Olga [200]

Answer:

\rm 1.64\times 10^{3}\; J.

Explanation:

Assume that his calorimeter is sufficiently effective, such that no heat had escaped to the surroundings. Heat from this solution would be absorbed by either

  • the solution, or
  • the coffee cup.

Temperature change: 33.637 - 23.722 = \rm 9.915\; ^\circ C.

<h3>Heat absorbed by the solution:</h3>

Only the specific heat capacity (per unit mass) of the solution is given. Both the mass of the solution and the temperature change will be required for determining the energy change. Start by finding the mass of the solution.

m = \rho \cdot V = 2\times 16.10 \times 1.00 = \rm 32.10\; g.

Calculate the amount of heat absorbed from the specific heat:

Q = c\cdot m \cdot \Delta T = 4.814\times 32.10 \times 9.915 = \rm 1335.80\; J.

<h3>Heat absorbed by the coffee cup:</h3>

The heat capacity of the coffee cup is given. Only the temperature change will be required for finding the amount of heat absorbed.

Q = C\cdot \Delta T = \rm 30.7\times 9.915 = 304.391\; J.

<h3>Heat that this reaction produces</h3>

Find the sum of the two parts of heat. Round to three significant figures as in the heat capacity of the coffee cup and the density of the solution.

\rm 1335.80+ 304.391 = 1.64\times 10^{3}\; J.

8 0
4 years ago
1875 kg car is traveling at 22 m/s. It’s momentum is?
Irina-Kira [14]
Momentum is Mass × Velocity
= 1875×22 = 41250 kg m/sec
8 0
3 years ago
Read 2 more answers
You are driving your car, and the traffic light ahead turns red. you apply the brakes for 2.26 s, and the velocity of the car de
Lorico [155]

Let the initial velocity of the car be u.

Final velocity of the car (v) = 5.43 m/s

deceleration (a) = - 2.78 m/s^2

Time taken (t) = 2.26 s

Using the first equation of motion:

v = u + at

u = v - at

u = 5.43 - (-2.78 \times 2.26)

u = 5.43 + 6.28

u = 11.71 m/s

Let the car's displacement be x.

Using second equation of motion:

x = ut + \frac{1}{2}at^2

x = 11.71 \times 2.26 - \frac{1}{2} \times 2.78 \times 2.26^2

x = 26.4646 - 7.0995

x = 19.3651 meters

Hence, the displacement of the car is 19.36 meters

6 0
3 years ago
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