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statuscvo [17]
3 years ago
9

One speed skater starts across a frozen lake at an average speed of 8 m/s. Ten seconds later, a second speed skater starts from

the same point and skates in the same direction at an average speed of 10 m/s. How many seconds after the second skater starts will the second skater overtake the first skater?
Physics
1 answer:
Luba_88 [7]3 years ago
7 0

Answer:

40 s

Explanation:

After 10 seconds, the first skater would have a 8m/s * 10s = 80 m head start

Let t be the number of seconds after the second skater starts will the second skater overtake the first skater

The distance traveled by the first skater after t seconds is

s_1 = v_1t = 8t

Similarly the distance traveled by the 2nd skater after t seconds is

s_2 = v_2t = 10t

Since the 2nd skater catches up to the 1st one after 80 m behind, the distance traveled by the 2nd one must be 80m greater than the distance of the 1st skater

s_2 = s_1 + 80

We can substitute s_1 = 8t, s_2 = 10t

10t = 8t + 80

2t = 80

t = 80 / 2 = 40 s

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8 0
3 years ago
Which of the following is not an example of an engine?
SashulF [63]
The answer is A. waterfall
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4 0
3 years ago
Which force keeps an object moving in a circle? centripetal force fluid friction inertia momentum
Virty [35]

Answer:

Any object moving in a circle (or along a circular path) experiences a centripetal force. That is, there is some physical force pushing or pulling the object towards the center of the circle. This is the centripetal force requirement.

Explanation:

3 0
3 years ago
Two rollerbladers face each other and stand at rest on a flat parking lot. Tracey has a mass of 32 kg, and Jonas has a mass of 4
satela [25.4K]

Mass of Tracey M1 = 32 kg

Mass of Jonas M2 = 45 kg

Initially both were at rest

so V1i = V2i =0

after pushing each other Jonas speed V2f = 0.80 m/s

we need to find out final speed of Tracy

Here we can use momentum conservation as no external force is acting here

M1V1i + M2V2i = M1V1f + M2V2f

32(0) + 45(0) = 32 V1f + 45(0.80)

0 = 32 V1f + 36

-36 = 32 V1f

V1f = - 1.125 m/s

negative sign shows that Tracy will move opposite to the Jonas

so answer in two significant figure would be

V1f = 1.1 m/s

7 0
3 years ago
Read 2 more answers
A wedge shaped air film is made between two sheets of glass using a spacer at one end of the glass sheets. If light of wavelengt
pychu [463]

Answer:

1178 nm

Explanation:

We are given that

Wavelength of light=\lambda=589nm=589\times 10^{-9} m

1nm=10^{-9} m

We have to find the thickness of spacer if five dark fringes are observed between the edges of the glass.

Suppose that first dark fringe and fifth dark fringe near spacer, then the path length of light is 4 times the wavelength of light.

The light passes through air film is two times  then the change in air film thickness  from one edge to other is two times the wavelength of light.

Change in air film thickness  from one edge to other edge  is same as the thickness of spacer.

Therefore, thickness of spacer=2\lambda

Thickness of spacer=2\times 589\times 10^{-9}m

Thickness of spacer=1178 nm

Hence, the thickness of spacer=1178 nm

8 0
3 years ago
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