Answer:
a, 7.26kg
b, 36.59N
Explanation:
The question says it swings like a pendulum, as such, we would use the formula for circular acceleration.
a = v²/r
a = 4.2²/3.7
a = 17.64/3.7
a = 4.77m/s²
The acceleration of the ball is directed towards the centre because circular acceleration is usually directed towards the centre
To find tension, recall, F = ma
m = F/a
m = 71.2/9.81
m = 7.26kg
In solving for tension then, we use our acceleration to be (9.81 - 4.77) = 5.04m/s²
Tension = ma
Tension = 7.26 * 5.04
Tension = 36.5904
Hence the tension in the rope is 36.59N
Answer:
His conclusion best illustrates a pessimistic outlook.
Explanation:
As seen in the question above, Ken got 20% of his final grade in the first test he did for this class, that is, there will be other tests that can provide him to reach the grade needed to pass the class. However, even if there are possibilities, he believes that he will not pass the class, he does not have a positive and optimistic view of his future in this class and is sure that he will fail. This negative view of the future is an example of a pessimistic outlook.
Answer:
0.88 cm
Explanation:
Initial length at 10°c, L = 23 m
Rise of temperature, Δt = 42 - 10 = 32°c
Coefficient of linear expansion of concrete, α = 12 x 10^(-6) per°c
Minimum spacing to be left = α L Δt
= 8.832 x 10^{-1} cm
= 0.88 cm
Note: I have a chosen a general value of 12 x 10^-6 per deg c for coefficient of expansion of concrete. However, please refer to the value given in your text book and substitute it for an accurate answer.
Answer:
Because most of the human body (about 70% of it) consists of water
Explanation:
The main reason why the specific heat capacity of the human body is very close to that of water is that water makes approximately 70% of the substances of which the human body consists. However, the human body has a slightly smaller specific heat capacity than water, because it contains also other elements/substances, and since water is one of the substances with the higher specific heat capacity at all, the specific heat capacity of the body is a bit smaller.
