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bija089 [108]
3 years ago
6

The student drops one cannonball, and exactly 1.0 s later drops the other cannonball from the same height. What is the time inte

rval between the first cannonball striking the ground and the second cannonball striking the ground?
Physics
1 answer:
Karolina [17]3 years ago
6 0
1s as long as the height remains the same the time will be the same
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A boy rows a rowboat across a river. The boat moves at 4.3 m/s at a direction of 25°
NikAS [45]

East component: 3.9 m/s

South component: 1.8 m/s

Explanation:

We have to resolve the velocity vector along the east and south axis.

Taking east as positive x-direction and south as positive y-direction, the components of the velocity are given by:

v_x = v cos \theta\\v_y = v sin \theta

where

v = 4.3 m/s is the magnitude of the velocity

\theta=25^{\circ} is the angle between the direction of the velocity and of the x-axis

Substituting into the equations, we find:

East component:

v_x = (4.3)(cos 25^{\circ})=3.9 m/s

South component:

v_y = (4.3)(sin 25^{\circ})=1.8 m/s

Learn more about vector components:

brainly.com/question/2678571

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5 0
4 years ago
Donna is leaming about the water cycle in school. She knows that runoff is water that flows over land surfaces,
77julia77 [94]

Answer:

ummm imma need the picture bud

Explanation:

7 0
3 years ago
If a ball is dropped from rest and falls 8 m to the ground, what is the speed just before it
Natalija [7]

Answer:

12.5m/s

Explanation:

(Assuming the question was asking for the speed just before it hit the ground)

We can use the first key equation of accelerated motion

Vf^2 = Vi^2+2aΔd

Vf^2 = 0 + 2(9.8)(8) (plugged in values, initial velocity is 0 since the ball was at rest)

Vf^2 = 156.8

Vf = 12.5 (squared both sides)

4 0
3 years ago
A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (25 degrees C) a
Sphinxa [80]

Answer:

 \eta=0.067

Explanation:

Given that

Temperature of warm water ,T₁ = 25 °C

Temperature of cold water ,T₂ = 5 °C

The maximum possible efficiency of any heat is will be same as the efficiency of the Carnot heat engine.Therefore the maximum efficiency of OTEC system is given as follows

\eta=1-\dfrac{T_2}{T_1}      

T should be Kelvin scale

Now by putting the values

\eta =1-\dfrac{5+273}{25+273}

\eta=0.067

Therefore the maximum efficiency will be 0.067 or 6.7%.

8 0
3 years ago
Energy is transmitted only in indivisible discrete quantities. True or False
alex41 [277]

Answer:

False

Explanation:

From the fact that light is emitted in portion, it does not follow that light ray is discrete in structure.

The way Einstein put it was that if a beer is always sold in pint bottles, that does not mean that beer contain of indivisible pint bottles. Yet experiments in which light  knocked electrons out of materials insistently made the point that light is absorbed only in the form of discrete portions. An emitted portion or quantum of light energy retains it's individuality in subsequent events as well.

This concept was first stated by Einstein in 1905. From the heuristic point of view that he developed light is always made up of discrete portions possessing energy and momentum.

5 0
3 years ago
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