All categories

3 years ago

I DO NOT WANT LINKES OR …………..

Physics

2 answers:

il63 [147K]3 years ago

4 0

1st B is correct option

2nd D is correct option

Veseljchak [2.6K]3 years ago

3 0

B-
Reasoning: a vacuum is empty space, therefore light can travel through, sound waves cannot travel through empty space!

You might be interested in

1) A fan is to accelerate quiescent air to a velocity of 8 m/s at a rate of 9 m3/s. Determine the minimum power that must be sup

azamat

Answer:

$\dot{W} = 339.84 W$

Explanation:

given data:

flow Q = 9 m^{3}/s

velocity = 8 m/s

density of air = 1.18 kg/m^{3}

minimum power required to supplied to the fan is equal to the POWER POTENTIAL of the kinetic energy and it is given as

$\dot{W} =\dot{m}\frac{V^{2}}{2}$

here $\dot{m}$ is mass flow rate and given as

$\dot{m} = \rho*Q$

$\dot{W} =\rho*Q\frac{V^{2}}{2}$

Putting all value to get minimum power

$\dot{W} =1.18*9*\frac{8^{2}}{2}$

$\dot{W} = 339.84 W$

7 0

3 years ago

A square current loop 5.5 cm on each side carries a 550 mA current. The loop is in a 1.1 T uniform magnetic field. The axis of t

Nadya [2.5K]

Answer:

$\tau =0.000915\ Nm$

Explanation:

given,

side of loop = 5.5 cm = 0.055 m

current on each side of loop = 550 m A = 0.55 A

magnetic field on the loop = 1.1 T

axis of the loop make an angle of = 30°

torque = ?

$\tau = i \times A\times B \times sin \theta$

$\tau = 0.55 \times 0.055^2\times 1.1 \times sin 30^0$

$\tau =0.000915\ Nm$

hence, the torque on the current loop is $\tau =0.000915\ Nm$

3 0

4 years ago

Please help! Will give a lot of points

krek1111 [17]

Answer:

Chemical and Biological weathering.

Explanation:

Processes that break down and weaken earth minerals are known as weathering. Over time, this can lead to erosion, in which huge sections of rock and stone are carried away, changing landscapes. Physical weathering alters the material structure of rocks, while chemical weathering alters their chemical structure.

3 0

3 years ago

In a waterfall, water falls 60 m. Assume all the potential energy change increases its enthalpy (or internal energy, in this cas

iVinArrow [24]

Answer:

The temperature rise of the water is = 0.14 °c

Explanation:

Height = 60 m

Potential energy change ΔP = $m gh$

ΔP = m × 9.81 × 60

ΔP = (588.6 × m) Joule

Since the Potential energy change is equal to the internal energy change or Enthalpy change.

ΔP = ΔH

Since ΔH = m × C × ΔT

⇒ ΔP = m × C × ΔT

Put all the values in above formula we get

⇒ 588.6 × m = m × 4184 × ΔT

⇒ ΔT= 0.14 °c

Therefore the temperature rise of the water is = 0.14 °c

4 0

3 years ago

Which statement correctly describes one

Vedmedyk [2.9K]

(3) The amount of energy a sound wave transmits is directly related to the wave's amplitude.
We can even tell this physically because the larger the amplitude, the louder sound is.

3 0

3 years ago