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scoray [572]
3 years ago
5

Sarah observed that different kinds and amounts of fossils were present in a cliff behind her house. She wondered if changes in

fossil content occurred from the top to the bottom of the cliff. She marked the cliff at five positions: 5, 10, 15, 20 and 25 meters from the top. She dug out and removed 1 bucket of soil from each of the positions and determined the kind and
number of fossils in each sample.

What was the hypothesis?
Physics
1 answer:
MAXImum [283]3 years ago
6 0
This is the answer: Fossil's found in Susan's yard are from prehistoric times.
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If state law mandates that elevators cannot accelerate more than 4.80 m/s2 or travel faster than 19.8 m/s , what is the minimum
Rudik [331]

Answer:

23.0 s

Explanation:

Given:

v₀ = 0 m/s

v = 19.8 m/s

a = 4.80 m/s²

Find: Δx and t

v² = v₀² + 2aΔx

(19.8 m/s)² = (0 m/s)² + 2 (4.80 m/s²) Δx

Δx = 40.84 m

v = at + v₀

19.8 m/s = (4.80 m/s²) t + 0 m/s

t = 4.125 s

The elevator takes 40.84 m and 4.125 s to accelerate, and therefore also 40.84 m and 4.125 s to decelerate.

That leaves 291.3 m to travel at top speed.  The time it takes is:

291.3 m / (19.8 m/s) = 14.71 s

The total time is 4.125 s + 14.71 s + 4.125 s = 23.0 s.

8 0
3 years ago
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tino4ka555 [31]

Answer:

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3 years ago
The​ Eco-Marathon is an annual competition sponsored by Shell​ Oil, in which participants build special vehicles to achieve the
OverLord2011 [107]

Answer:

(1)  V=0.03348 gallons

(2)  L= 576.813 km .

Explanation:

Write the relation between the density and volume for ethanol.

density ( ρ )= m/V

Volume ( V )= m/ρ .......... (1)

Here, V is the volume of ethanol, m is the mass of ethanol, and  is the density of ethanol.

Write the relation between the specific gravity of ethanol and density of water

ρ=γ*ρ(water)  ............. (2)

Here,  is specific gravity of ethanol and  is the density of water.

Determine the volume of ethanol by substituting equation (2) in equation (1)

V=m/γ*ρ(water)

Substitute 100 gm , for m,  for , and 1000 kg/m  for.

V=\frac{100*10^{-3} }{0.789*1000}

V=0.000112674 m^{3

Convert m³ to gallons

V= (0.000112674*264.172 )

V=0.03348 gallons

Step 2:

Determine the distance travelled by the special vehicle named “Micro joule” runs with ethanol.

L=C*V    .......... (3)

Here,  is the rate of consumption of ethanol by Micro joule.

Substitute 10,705 mi/gallons  for C and 0.03348 gallons  for .

By using eq. 3.

L= 10750*0.03348

L=358.416 mi.

Convert the distance travelled by Micro joule from miles to kilometres

L= (358.416* 1.60934)

L = 576.813 km

Thus, the distance travelled by Micro joule is 576.813 km .

4 0
2 years ago
a bus travels north on some busy city streets for 2.5 km, and a trip that takes 9 minutes. At one point in the trip, the bus is
vazorg [7]

Answer:

Instantaneous velocity at the red light is 0 m/s.

Instantaneous velocity at another point is 18 m/s towards north.

Explanation:

Instantaneous velocity is the velocity of a body at any given moment of time.

It's the current speed and direction in which it acts.

When the bus is at the red light, it is not in motion at that point. So, the instantaneous velocity of the bus is 0 m/s at that moment of time.

Again, at another point, the bus is moving with constant speed of 18 m/s, so the instantaneous velocity is also 18 m/s but with a specified direction as velocity is a vector quantity.

So, the instantaneous velocity when the bus is moving with constant speed is 18 m/s towards north.

3 0
2 years ago
Convection currents, which affect weather and climate, are created by _____.
astraxan [27]
The uneven heating of the earth
7 0
2 years ago
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