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AveGali [126]
2 years ago
8

(ix) A pin hole camera gives a sharp image because;

Physics
2 answers:
sdas [7]2 years ago
8 0

Answer:

d) The screen is in a short distance from the hole

loris [4]2 years ago
4 0

Answer:

the screen is in a short distance from the hole

Explanation:

(d) option is correct

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I need help quick!! Urgent!
faltersainse [42]

C.

Explanation: Because mirrors are lighter, and they are easier than lenses to make perfectly smooth.

6 0
2 years ago
Two children are pulling and pushing a 30.0 kg sled. The child pulling the sled is exerting a force of 12.0 N at a 45o angle. Th
djverab [1.8K]

Answer:

okay sooo the weight is: 294 n

the normal force is 286 n

the acceleration is: -0.38 m/s²

4 0
2 years ago
You need to design a 60.0-Hz ac generator that has a maximum emf of 5500 V. The generator is to contain a 150-turn coil that has
olchik [2.2K]

Answer:

So magnetic field will be equal to 0.1144 T  

Explanation:

We have given frequency f = 60 Hz

Maximum emf e = 5500 volt

Number of turns N = 150

Area A=0.85m^2

Emf generated in ac generator is given e=NBA\omega sin(\omega t)

For maximum emf sin(\omega t)=1

So maximum emf will be equal to e=NBA\omega

B=\frac{e}{NA\omega }=\frac{5500}{150\times 2\times 3.14\times 60\times 0.85}=0.1144T

So magnetic field will be equal to 0.1144 T

3 0
3 years ago
A 2.00 kg object is moving in a circular path with a radius of 5.00 cm. The object starts from rest and with constant angular ac
Rom4ik [11]

Answer:

0.800 m/s²

Explanation:

First, calculate the angular acceleration:

ω = αt + ω₀

6.00 rad/s = α (3.00 s) + 0 rad/s

α = 2.00 rad/s²

Now calculate the angular velocity at t = 2.00 s:

ω = αt + ω₀

ω = (2.00 rad/s²) (2.00 s) + 0 rad/s

ω = 4.00 rad/s

Calculate the linear velocity:

v = ωr

v = (4.00 rad/s) (0.0500 m)

v = 0.200 m/s

Finally, calculate the centripetal acceleration:

a = v² / r

a = (0.200 m/s)² / (0.0500 m)

a = 0.800 m/s²

3 0
3 years ago
A motor was overheating because of low voltage at its terminals. A transformer was installed to correct the problem. What is the
SVEN [57.7K]

Answer:

  240 V

Explanation:

The obvious answer is that if the transformer is connected directly to the motor (with no intervening losses), the output voltage of the transformer must match the required input voltage of the motor, 240 V.

__

We're not given, or asked for any other information, so this is all we can say about the connection. Whether a transformer with a 240 V secondary rating is adequate, we have not enough information to say.

7 0
3 years ago
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