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4 years ago

The temperature of an object can be raised by adding _ or doing _ on a system.

Physics

1 answer:

Nookie1986 [14]4 years ago

7 0

D is the answer because you cause heat by exerting energy

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A 5 kg book falls from a shelf. If it lands at a speed of 5.7 m/s, from what height did it fall?

Pachacha [2.7K]

Answer:

57m

Explanation:

speed = 5.7m/s

or 57/10 m/s

so definitely the time taken will be 10 secs

so speed = distance/time taken

5.7= distance/10

distance = 5.7× 10

Distance = 57m

7 0

3 years ago

Energy is _______ when it's moved from one object to another.

zzz [600]

Energy is (transferred) when it is moved from one obect to another.

The answer is (b)

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3 years ago

Read 2 more answers

How will you separate mixture of metal and nonmetal objects

mojhsa [17]

I think it’s by using a magnet because metals are magnetic

7 0

3 years ago

Can someone help me ?

Paraphin [41]

Explanation:

300m÷60s=5m/s

hope this can help maybe

8 0

2 years ago

An 30-turn coil has square loops measuring 0.341 m along a side and a resistance of 3.61 Ω. It is placed in a magnetic field tha

Verdich [7]

Answer:

Thus, the induced current in the coil at $t =1.73s$ is 9.98 A.

Explanation:

Faraday's law says

$\varepsilon = N \frac{d \Phi_B}{dt}$

where $N$ is the number of turns and $\Phi_B$ is the magnetic flux through the square coil:

Now,

$N = 30$

$\theta = 37.5^o$

$A = (0.341m)^2= 0.11623m^2$

$B = 1.45t^3$ ;

therefore,

$\varepsilon = N \frac{d \Phi_B}{dt} = N\frac{d ( BA\:cos(\theta))}{dt} = 30*\frac{d ( (1.45t^2)(0.1163)\:cos(37.5^o))}{dt}$

$=30*(0.1163)\:cos(37.5^o)*1.45*\dfrac{d ( t^3)}{dt} = 12.04t^2$

$\boxed{\varepsilon = 12.04t^2}$

is the emf induced in the coil.

Now, the loop is connected to $R = 3.61\Omega$ resistance; therefore, at $t = 1.73s$

$\varepsilon = RI = 12.04t^2$

$RI = 12.04(1.73)^2$

$RI = 36.03$

$I = \dfrac{36.03}{3.61\Omega }$

$\boxed{I = 9.98A }$

Thus, the current in the coil at $t =1.73s$ is 9.98 A.

8 0

4 years ago

The temperature of an object can be raised by adding _________ or doing _________ on a system.

The temperature of an object can be raised by adding _ or doing _ on a system.