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tatuchka [14]
4 years ago
8

An object's reflection in a plane mirror appears to be 30 m away. How far is the real object from the mirror?

Physics
1 answer:
lapo4ka [179]4 years ago
5 0
30 m away.the image is the same distance behind the mirror as the object is in front of it. if stand a 5m away from the mirror then ur image will also be 5m behind the mirror.  
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Please help! Will give brainliest. 10 points. Show work!
Natasha_Volkova [10]

Answer:

421.83 m.

Explanation:

The following data were obtained from the question:

Height (h) = 396.9 m

Initial velocity (u) = 46.87 m/s

Horizontal distance (s) =...?

First, we shall determine the time taken for the ball to get to the ground.

This can be calculated by doing the following:

t = √(2h/g)

Acceleration due to gravity (g) = 9.8 m/s²

Height (h) = 396.9 m

Time (t) =.?

t = √(2h/g)

t = √(2 x 396.9 / 9.8)

t = √81

t = 9 secs.

Therefore, it took 9 secs fir the ball to get to the ground.

Finally, we shall determine the horizontal distance travelled by the ball as illustrated below:

Time (t) = 9 secs.

Initial velocity (u) = 46.87 m/s

Horizontal distance (s) =...?

s = ut

s = 46.87 x 9

s = 421.83 m

Therefore, the horizontal distance travelled by the ball is 421.83 m

5 0
3 years ago
Part A
Blababa [14]

Answer:

The wavelength decreases as the electron speeds up. The wavelength increases as the electron slows down.

Explanation:

5 0
3 years ago
If the magnitude of a positive charge is tripled, what is the ratio of the original value of the electric field at a point to th
dybincka [34]

Answer:

Here is the complete question.

If the magnitude of  a positive charge is tripled, what is the ratio of the original value of the electric field at a point to the new value of the electric field at that same point.

a) 1:2

b) 1:3

c)1:6

d)1:9

b) 1:3 is the correct option.

Explanation:

7 0
3 years ago
Help
arlik [135]
I think the answer is C
7 0
3 years ago
A speeding car has a velocity of 80 mph; suddenly it passes a cop car but does not stop. When the speeding car passes the cop ca
bezimeni [28]

Answer:

Distance= 4 miles

Time = 36.3 seconds

Explanation:

80 mph = 178.95 m/s

90 mph = 201.32 m/s

V = u +at

201.32= 0+a(4.5)

201.32/4.5= a

44.738 m/s² = a

Acceleration of the cop car

= 44.738 m/s²

Distance traveled at 4.5seconds

For the cop car

S= ut + ½at²

S= 0(4.5) + ½*44.738*4.5

S= 100.66 meters

Distance traveled at 4.5seconds

For the speeding car

4.5*178.95=805.275

The cop car will still cover 704.675 +x distance while the speeding car covers for their distance to be equal

X/178.95= (704.675+x)/201.32

X-0.89x= 626.37

0.11x= 626.37

X= 5694.3 meters

The time = 5694.3/178.95

Time =31.8 seconds

So the distance they meet

= 5694.3+805.275

= 6499.575 meters

= 4.0 miles

The Time = 4.5+31.8

Time = 36.3 seconds

8 0
4 years ago
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