3 years ago

4. What are 3 things that you can think of doing, that would reduce your electricity bill?

1 answer:

3 0

Turn off standby appliances.
Install a smart thermostat.
Turn down your thermostat.
Buy efficient appliances.
Install a new boiler.
Wash clothes at a lower temperature.
Be smarter about water.
Invest in double glazing.

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Which scientist discovered the two radioactive elements radium and polonium?

kolezko [41]

The scientist who discovered the two elements radium and polonium would be Marie Curie in 1898.

Hope this helps!

6 0

4 years ago

The work done in holding a 30kg of bricks to a height of 20m is

ella [17]

The work done to "HOLD" a load of bricks at any height is zero.
Work is done only when force acts through a DISTANCE.

The work done to LIFT 30 kg of anything to 20m higher than
it already is, is

(force) · (vertical distance)

= (mass) · (gravity) · (vertical distance)

= (30 kg) · (9.8 m/s²) · (20 m)

= 5,880 joules

8 0

3 years ago

Does the sign of the charge (positive or negative) affect how that charge is dissipated? Explain.

labwork [276]

This is an add proceeded by

5 0

3 years ago

A car slows down uniformly from a speed of 22 m/s to rest in 4.0 seconds. How far did it travel in that time

krek1111 [17]

Answer:

$\boxed{\sf Distance \ travelled = 44 \ m}$

Given:

Initial speed (u) = 22 m/s

Final speed (v) = 0 m/s (Rest)

Time taken (t) = 4 seconds

To Find:

Distance travelled by car (s)

Explanation:

From equation of motion of object moving with uniform acceleration in straight line we have:

$\boxed{ \bold{s = (\frac{v + u}{2} )t}}$

By substituting value of v, u & t in the equation we get:

$\sf \implies s = ( \frac{0 + 22}{2} ) \times 4 \\ \\ \sf \implies s = \frac{22}{2} \times 4 \\ \\ \sf \implies s = 11 \times 4 \\ \\ \sf \implies s = 44 \: m$

$\therefore$

Distance travelled by car (s) = 44 m

4 0

4 years ago

Which interaction of nature is weakest?

LekaFEV [45]

Electromagnetic would be the weakest interaction of nature.

5 0

3 years ago