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4 years ago

1. A heat lamp is designed to keep food and other things warm. Would it also make a good tanning lamp? Why or why not?

2 answers:

6 0

1 isn't a tanning lamp one which produces UV ? a heat lamp does IR. so no.
2 speed of light = frequency times wavelength. 300,000,000/0.25 = frequency.

NemiM [27]4 years ago

4 0

1. becuase it is so hot that it could tan or be used to keep warm.

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Define the focus of a concave lens

Sophie [7]

Answer:

Principal focus of concave lens - 

★ The point at which rays parallel to principal axis coming from infinity appear to converge after being refracted from concave lens is called the principal focus of concave lens.

________________________

• Additional information - 

★ Principal focus - A number of rays parallel to the principal axis after reflection from a concave mirror meet at a point on the principal axis or appear to come from a point after reflection from a convex mirror on the principal axis. This is called principal focus.

8 0

3 years ago

A weightlifter must exert 25 Newtons of force to

kakasveta [241]

$Work=Force \: × \: displacement \\ => W=Fs \\ \\ Given, \\ Force=25 \: N \\ Displacement=2m \\ \\ so \: work = 25 \: N \: \times 2m \\ = > work = 25kgm {s}^{ - 2} \times 2m \\ = > work = 50kg {m}^{2} {s}^{ - 2} \\ = > work = 50J$

This is the answer.

Hope it helps!!

6 0

3 years ago

A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is

miv72 [106K]

Current=2.5A=I
Inductance=B=5H

We know

$\boxed{\sf Magnetic\:flux=\O=BA}$

$\\ \qquad\quad\sf{:}\dashrightarrow \O=5(2.5)$

$\\ \qquad\quad\sf{:}\dashrightarrow \O=12.5Wb$

3 0

3 years ago

If someone adds millions of small fish to a lake , how would the number of big fish change?

sattari [20]

The population of big fish would increase because they have more food in that area. Hope this helps

6 0

3 years ago

Read 2 more answers

You slide down a steep slide at an amusement park. The slide is set up so that you are sitting on a blanket so that only the bla

viva [34]

Answer:

a. Your acceleration decreases, but never goes to zero.

Explanation:

Pushing down with hands on the blanket increases the normal force between the soil and the blanket and, therefore, increases the friction force. Nonetheless, the component of the gravity force parallel to the direction of the slide is higher than friction force and consequently, the acceleration decreases but never goes to zero.

6 0

3 years ago