Answer:
<em>Its speed will be 280 m/s</em>
Explanation:
<u>Constant Acceleration Motion</u>
It's a type of motion in which the speed of an object changes by an equal amount in every equal period of time.
If a is the constant acceleration, vo the initial speed, vf the final speed, and t the time, vf can be calculated as:
The object accelerates from rest (vo=0) at a constant acceleration of 
. The final speed at t=35 seconds is:
Its speed will be 280 m/s
ANSWER: B
EXPLANATION: There are four natural states of matter: Solids, liquids, gases and plasma. The fifth state is the man-made Bose-Einstein condensates. In a solid, particles are packed tightly together so they don't move much.
Answer: To "hole the ball: on the very first putt is requered is required a 7.08 m displacement at an angle 11.03° north of east.
Explanation:
Let's add each stroke as vectors
- Due east direction: 4.6 m + 2.5 cos(20°) m ≅ 6.95 m
- Due north direction: 0.5 m + 2.5 sin(20°) m ≅ 1.35 m
So the total displacement is
and the direction
Answer: <span>option B. Is liquid over a wide
temperature range; requires a large amount of energy per gram to raise
its temperature </span>
Justification:
Let's review every given statement:
A.
Is liquid over a narrow temperature range; requires a small amount of
energy per gram to raise its temperature
i) Water is liquid in a wide temperature range (depending of the pressure). At 1 atm the range is 0°C to 100 °C
ii) Water requires a large amount of energy per gram to raise its temperature. The amounf of energy required to increase the temperature of 1 gram of substance is called specific heat. Water has one of the largest specific heat which is a very important feature for the life. Since water can absorb large amounts of heat before changing its temperature, the temperatures of oceans keeps well and aquatic life is possible.
B. Is liquid over a wide
temperature range; requires a large amount of energy per gram to raise
its temperature
The two points were discussed in the choice A, concluding that they are true. So this is the right answer.
C. Has weak cohesive forces between molecules; is liquid
over a wide temperature range
i) Water has strong cohesive forces between molecules. The cohesive force is explained by the hydrogen bonds and manifested in the surface tension of water.
So, this option is wrong.
D. Has strong cohesive forces between
molecules; is liquid over a narrow temperature range.
The first statement is true as explained above, while the second one was denied during the discussion of choice A. So, this option is also false.
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