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PilotLPTM [1.2K]
3 years ago
9

List three sources of information scientists use to learn about ancient climates

Physics
2 answers:
blagie [28]3 years ago
5 0
Rocks,Fossils,Carbon dating
natta225 [31]3 years ago
4 0
Rocks fossils and carbon dating are three sources they use to date ancient climates
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(25%) Problem 3: A bullet is fired horizontally into an initially stationary block of wood suspended by a string and remains emb
Rus_ich [418]

Answer:

Thus, the initial velocity of the bullet is 507.5 m/s.

Explanation:

mass of bullet, m = 0.0085 kg

mass of block, M = 0.99 kg

Height raised, h = 0.95 m

Let the initial velocity of bullet is u and the final velocity of block and bullet system is v.

Use conservation of energy

Potential energy of bullet bock system = kinetic energy of bullet block system

(M+m)\times g\times h = \frac{1}{2}\times \left ( M+m \right )v^{2}

v=\sqrt{2gh}

v=\sqrt{2\times 9.8\times 0.95}=4.32 m/s

Now use conservation of linear momentum

mu = (M+m) v

0.0085 x u = (0.99 + 0.0085) x 4.32

0.0085 u = 4.314

u = 507.5 m/s

Thus, the initial velocity of the bullet is 507.5 m/s.  

4 0
3 years ago
A hockey puck attached to a horizontal spring oscillates on a frictionless, horizontal surface. The spring has force constant 4.
bekas [8.4K]

Answer:

m = 0.164 kg

Explanation:

T (period)

k (force/spring constant)

m (mass)

T = 2*Pi*sqrt(m/k)

T/(2*Pi) = sqrt(m)/sqrt(k)

(T/(2*Pi))*sqrt(k) = sqrt(m)

m = ((T/(2*Pi))*sqrt(k))^2

m = 4.5*((1.2/(2*Pi)))^2

m = 0.1641403175

3 0
3 years ago
Cuál es la velocidad de un camión que recorre 15 km en 6 minutos?​
kramer

Answer:

41.6666667 m / s

Explanation:

Esa es la respuesta. Esto es en metros.

8 0
3 years ago
Read 2 more answers
Air flowing from the equator to the poles rises and falls in looping patterns. What are these patterns called?
AysviL [449]
The correct answer for the given question above would be option B. Air flowing from the equator to the poles rises and falls in looping patterns and these patterns are called convection cells. Convection cells<span> is an important process in the formation of landforms and the movement of winds. Hope this answers your question.</span>
8 0
3 years ago
Read 2 more answers
The molecular weight of oxygen gas (o2) is 32 while that of hydrogen gas (h2) is 2.
anzhelika [568]

use the formula: v^2=(3kT)/m

Where:

<em>v is the velocity of a molecule</em>

<em>k is the Boltzmann constant (1.38064852e-23 J/K)</em>

<em>T is the temperature of the molecule in the air</em>

<em>m is the mass of the molecule</em>

For an H2 molecule at 20.0°C (293 K):

v^2 = 3 × 1.38e-23 J/K × 293 K / (2.00 u × 1.66e-27 kg/u)

v^2 = 3.65e+6 m^2/s^2

v = 1.91e+3 m/s

For an O2 molecule at same temp.:

v^2 = 3 × 1.38e-23 J/K × 293 K / (32.00 u × 1.66e-27 kg/u)

v^2 = 2.28e+5 m^2/s^2

v = 478 m/s

Therefore, the ratio of H2:O2 velocities is:

1.91e+3 / 478 = 4.00

7 0
3 years ago
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