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3 years ago

An image of a car with height of 14 cm occurred in the mirror which is located at a T-

Physics

1 answer:

fomenos3 years ago

7 0

Hello dear

When a concave mirror is used as rear view mirror then vehicles or any object behind the vehicle in which concave mirror is used

looks bigger than its actual size ,

2. it also looks more closer than actual

3. and it also do not give wider view of coverage .

Thus , it might lead to accidents of vehicles

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If a 8860 N horse has been lifted 4.5 meters by a crane, what work does it have?

Lana71 [14]

Data:
W (work) = ? (Joule)
P (weight) = 8860 N
h (height) = 4.5 m

Formula:
 $W = P*h$

Solving:
 $W = P*h$
$W = 8860*4.5$
$\boxed{\boxed{W = 39870\:Joule}}\end{array}}\qquad\quad\checkmark$

4 0

3 years ago

Astronomers have recently observed stars orbiting at very high speeds around an unknown object near the center of our galaxy. Fo

nataly862011 [7]

Answer:

The mass of the object is 745000 units of the sun

Explanation:

We know that the centripetal force with which the stars orbit the object is represented as

$F_{c}$ = $\frac{mv^{2} }{r}$

and this centripetal force is also proportional to

$F_{c}$ = $\frac{kMm}{r^{2} }$

where

m is the mass of the stars

M is the mass of the object

v is the velocity of the stars = 10^6 m/s

r is the distance between the stars and the object = 10^14 m

k is the gravitational constant = 6.67 × 10^-11 m^3 kg^-1 s^-2

We can equate the two centripetal force equations to give

$\frac{mv^{2} }{r}$ = $\frac{kMm}{r^{2} }$

which reduces to

$v^{2}$ = $\frac{kM}{r}$

and then finally

M = $\frac{rv^{2} }{k}$

substituting values, we have

M = $\frac{10^{14}*(10^{6})^{2} }{6.67*10^{-11} }$ = 1.49 x 10^36 kg

If the mass of the sun is 2 x 10^30 kg

then, the mass of the the object in units of the mass of the sun is

==> (1.49 x 10^36)/(2 x 10^30) = 745000 units of sun

6 0

3 years ago

A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. i

ollegr [7]

Magnetic field outside it due to long wire is given by

$B = \frac{u_o i}{2 \pi r}$

Magnetic field due to long wire inside wire at any point

$B = \frac{u_o i r}{2 \pi R^2}$

Now the ratio of two magnetic field is given by

$\frac{B_{in}}{B_{out}} = \frac{r_1/R^2}{1/r_2}$

$\frac{0.285}{0.200} = \frac{4*10}{R^2}$

$1.425 = \frac{40}{R^2}$

R = 5.3 mm

8 0

3 years ago

Describe how can two or more velocities be combined

eduard

Two or more velocities add by vector addition

4 0

3 years ago

Compared to a blue star in the same local cluster, the surface temperature of a red star is a) greater. b) the same. c) lower. d

Andrew [12]

Hello! My name is Zalgo and I am here to help you out on this concluding day. The answer would be C);lower. The reason it would be lower is because the hottest color of flames would be blue. Considering the way a start emits light is fire, this would be the most logical reason for it.

I hope that this helps! :P

"Stay Brainly and stay proud!" - Zalgo

(By the way, do you mind marking me as Brainliest? I'd greatly appreciate it! Thanks! X3)

3 0

3 years ago