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4 years ago

ASAP ONLY ACTUAL CORRECT ANSWERS

Physics

2 answers:

fredd [130]4 years ago

8 0

Answer:

The correct option is A) I. The seasons change throughout the year

Explanation:

The Earth tilts around its axis which causes the Northern and Southern hemisphere of the Earth to switch places throughout the year. This causes the hemispheres to have alternate times in facing the Sun at a particular time. This causes the season to change in each part of the Earth. For example, when the Northern Hemisphere faces the Sun, summers will arise in the Norther hemisphere where as the Southern hemisphere will be away from the sun and have winter.

The tilt of the Earth is known to be at an angle of 23.5 degrees.

11111nata11111 [884]4 years ago

8 0

Answer: C) I and III only

Explanation: The tilt of the Earth's axis, combined with the Earth's orbit around the Sun, results in the changes in seasons throughout the year.

It also causes daytime (the number of hours of daylight) to be longer than nighttime during the summer than during the winter.

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A thin electrical heating element provides a uniform heat flux qo" to the outer surface of a duct through which air flows. The d

Ivanshal [37]

Answer:

a)q= 2800 W/m²

b)To=59.4°C

Explanation:

Given that

L = 10 mm

K= 20 W/m·K

T=30°C

h= 100 W/m²K

Ti=58°C

Heat flux q

q= h ΔT

q= 100 x (58 - 30 )

q= 2800 W/m²

As we know that heat transfer by Fourier law given as

Q= K A ΔT/L

Lets take outer temperature is To

So by Fourier law

To= Ti + qL/K

Now by putting the values

To= Ti + qL/K

$To= 58 + 2800 \times \dfrac{ 0.01}{20}$

To=59.4°C

5 0

3 years ago

The kinetic energy of a rotating body is generally written as K=12Iω2, where I is the moment of inertia (also known as rotationa

agasfer [191]

Answer

given,

expression of Kinetic energy of rotating body

$K = \dfrac{1}{2}I\omega^2$

ω = 34.0 rad/s

Assuming mass of the particle equal to 13 Kg

and perpendicular distance from the particle to the axis is r = 1.25 m

now,

moment of inertia of particle = ?

from the given expression

$I= \dfrac{2K}{\omega^2}$ ..............(1)

we know

$K = \dfrac{1}{2}mv^2$

v = r ω

$K = \dfrac{1}{2}mr^2\omega^2$

putting value in equation (1)

$I= \dfrac{2\dfrac{1}{2}mr^2\omega^2}{\omega^2}$

$I =mr^2$

$I =13 \times 1.25^2$

I = 20.3125 kg.m²

4 0

3 years ago

If the mass of the cement is 15 000 kg, calculate the density of this cement sample in kgm-3

MrRa [10]

Explanation:

Hi there!

Mass of the container (m) = 15000 kg

Also from the figure;

Volume of the container (V) = l*b*h

{ From figure length = 2m , breadth = 1.1m, height = 2.5m}

So,

V = (2*1.1*2.5) m³

= 5.5m³

Then;

Density (d) = m/v

= 15000/5.5

= 2727.27 kgm³

Therefore, the density is 2727.27 kgm³.

Hope it helps!

5 0

2 years ago

Which vector has a y-component with a length of 3?<br> A. C<br> B. d<br> C. a<br> D. b

goldenfox [79]

Answer:

Option C : a

Explanation:

4 0

3 years ago

Two 5.0-cm-diameter conducting spheres are 8.0 m apart, and each carries 0.12 mC. Determine (a) the potential on each sphere, (b

blagie [28]

Answer:

Explanation:

Two spheres 10m apart

Each charge on the sphere is 0.12mC= 0.12×10^-3C

Given that the diameter is

5cm=0.05m

Then, the radius is diameter / 2

r=d/2

r=0.05/2

r=0.025m

Potential is given as

V=kq/r

k=9×10^9Nm2/C2

a. Potential on each sphere surface.

They are going to have the same value since the sphere are identical

At the surface of the sphere,

r= 0.025m

V=kq/r

V=9E9×0.12E-3/0.025

V=4.32E7Volts

V=4.32×10^7Volts

b. The electric field at the surface of each sphere will be the same since the charge are identical,

So, Electric field is given as

E=kq/r^2

At the surface

E=9E9×0.12E-3/0.025^2

E=1.728×10^8N/C

c. The potential mid way between the two sphere

The potential difference due to the first sphere

The sphere are 10m apart then the distance mid way is 5m

Then, the radius of the sphere is 0.025m

Total distance from the center is 5.025m

Then,

V=kq/r

V1=9E9×0.12E-3/5.025

V1=2.149×10^5 Volts

Potential difference due to the second sphere is the same as the first, since both are identical

Total potential is V1 +V2

V=2.149E5+2.149E5

V=4.3E5Volts

Total potential at the middle due to the two sphere is 4.3×10^5Volts

d. The potential difference between the sphere at any point is equal to the potential difference found at c

Therefore the potential difference is

V=4.3×10^5Volts

4 0

3 years ago