The horizontal and vertical parts of vector are called ...

What happens if an air conditioner is used in a house that is not well insulated and not well scaled? Explain in terms of energy

stira [4]

It will use a lot more energy (electricity) to cool down the room. Because heat energy from outside the room can easily transfer into the room again if the room is not well insulated. So more energy is needed to cool down the room again

4 0

3 years ago

Which of these is not an example of

prohojiy [21]

Answer:

A) The process that give us day and night.

Explanation:

From the answer choices provided the one that is not an example of this is the process that give us day and night. This is because, the day/night cycle occurs as the Earth spins on it's axis. This cause one side of the Earth to be facing the Sun, which is the side that is currently experiencing day time while the other side is experiencing night time. As the Earth spins the cycles repeat. This is not an example of revolving.

5 0

3 years ago

Assume that you can heat water with perfect insulation (all the heat from combustion of ethanol is transferred to water). What i

krok68 [10]

Answer:

volumme =0.36 ml

Explanation:

total heat required can be obtained by using following formula

$q= mC \Delta T$ .......(1)

where,

m - mass of water,

C - specific heat capacity of water and = 4.184 j g^{-1} °C

$\Delta T$ - total change in temperature. = 10°C

The density of water is 1 g/cc. hence, 200 mL of water is equal to 200 g

putting all value in the above equation (1)

q = 200*4.184* 10 ° = 8368 J.

Therefore total number of moles of ethanol required to supply 8368 J of heat is

$\frac {8368}{1368000} = 0.006117 moles.$

The molar mass of ethanol is 46 g/mol.

The mass of ethanol required is 46* 0.006117 = 0.28138 g

The density of ethanol is 0.78 g/ml.

The volume of ethanol required is

$\frac {0.28138}{0.78} = 0.36 ml$

8 0

3 years ago

At which point on this electric field will a test charge show the maximum strength?

Juli2301 [7.4K]

Answer:

A

Explanation:

The figure shows the electric field produced by a spherical charge distribution - this is a radial field, whose strength decreases as the inverse of the square of the distance from the centre of the charge:

$E\propto \frac{1}{r^2}$

More precisely, the strength of the field at a distance r from the centre of the sphere is

$E=k\frac{Q}{r^2}$

where k is the Coulomb's constant and Q is the charge on the sphere.

From the equation, we see that the field strength decreases as we move away from the sphere: therefore, the strength is maximum for the point closest to the sphere, which is point A.

This can also be seen from the density of field lines: in fact, the closer the field lines, the stronger the field. Point A is the point where the lines have highest density, therefore it is also the point where the field is strongest.

8 0

3 years ago

A uniform metre rod of 5 metre length is suspended horizontally by two strings P and Q.Pis attached 0.8 metre from one end and Q

denpristay [2]

Answer:

The tension in string P is 25 N, while that of Q is 85 N.

Explanation:

Considering the conditions for equilibrium,

i. Total upward force = Total downward force

$T_{P}$ + $T_{Q}$ = 110 N

ii. Taking moment about P,

clockwise moment = anticlockwise moment

110 × (2.5 - 0.8) = $T_{Q}$ × (3 - 0.8)

110 × 1.7 = $T_{Q}$ × 2.2

187 = 2.2 $T_{Q}$

$T_{Q}$ = $\frac{187}{2.2}$

$T_{Q}$ = 85 N

From the first condition,

$T_{P}$ + $T_{Q}$ = 110 N

$T_{P}$ + 85 N = 110 N

$T_{P}$ = 110 - 85

$T_{P}$ 25 N

Therefore, the tension in string P is 25 N while that of Q is 85 N.

5 0

3 years ago