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3 years ago

How does conserving and recycling paper help manage energy resources?

Physics

1 answer:

hammer [34]3 years ago

8 0

B is true, however that is not a way in which conserving and recycling paper helps manage energy sources...

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- Gas central heating is used for 5 days, using 102 kWh of energy. If 1 kWh of gas costs 7p, calculate the cost of using the cen

melamori03 [73]

Answer:

Explanation:

Given that,

Gas central heating was used for 5days

At a rate of 102kWh of energy

Then, 1 kWh = 7p

So,

The total time is 5days

t = 5days

1 day = 24hours

Then, t = 5days = 5 × 24 = 120hours

Given 102kWh, then, they consumers 102 kW in one hour, then, for the 120hours,

The total energy used is 102 × 24

Then, total energy = 2448 kWh

So, 1 kWh = 7p,

Then, 2448 kWh = 7 × 2448

2448 kWh = 17,136 p.

So, the cost of the using central heat is 17,136 p

6 0

3 years ago

Projectiles Launched Horizontally Quiz

NikAS [45]

Answer:

3.0 seconds

Explanation:

The time of flight of a projectile (the time it takes to reach the ground) does not depend on the horizontal motion, but only on its vertical motion.

In fact, the time of flight is determined by the suvat equation:

$s=ut+\frac{1}{2}gt^2$

where

s is the vertical displacement

u is the initial vertical velocity (0, in case of these two projectiles)

g = 9.8 m/s^2 is the acceleration of gravity (assuming downward as positive direction)

t is the time of flight

Re-arranging the equation, we get

$t=\sqrt{\frac{2s}{g}}$

We see that this time depends only on s (the heigth of the cliff) and g: therefore, since the two projectiles are launched from the same height, they take the same time to reach the ground, 3.0 seconds.

7 0

3 years ago

Why might a police department use a social media account? To catch up on local gossip in case it relates to a case, to network f

nadya68 [22]

In case people are doing illegal stuff on Social media

7 0

4 years ago

List three different types of magnets

Gennadij [26K]

The three types of magnets are temporary, permanent, and electromagnets.

4 0

3 years ago

Read 2 more answers

A body accelerates uniformly from rest at 2m/s square. calculate it's velocity after traveling 9m.

Talja [164]

Answer:

6m/s

Explanation:

Given parameters:

Initial velocity = 0m/s

Acceleration = 2m/s²

Distance = 9m

Unknown:

Final velocity = ?

Solution:

To solve this problem, we use the expression below:

v² = u² + 2as

v is the final velocity

u is the initial velocity

a is the acceleration

s is the distance

v² = 0² + (2 x 2 x 9) = 36

v = 6m/s

3 0

3 years ago