What type of matter does radiation happen in? (liquid,solid,or gas)
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Ответ:
Examples:
Light, radio, heat, and X-rays, all pass through glass (solid),
water (liquid), and air (gas) very easily.
(Moreover, I would be remiss if I failed to point out in addition that
microwave radiation passes through meatloaf and coffee with only
partial attenuation due to absorption.)
Ответ:
52.555 N
Explanation:Let's use Newton's second law of motion here which states that the resultant force (∑F) acting on a body is the product of the mass (m) of the body and the acceleration (a) due to this force. i.e
∑F = m x a (i)
Now, let's get the resultant force;
Two main forces are acting on the rope;
i. the weight (W) of the block acting downwards.
Where;
W = mass of block(m) x gravity(g) = m x g
ii. the tension (T) in the rope acting upwards.
Therefore, the resultant force is the vector sum of these two forces as follows;
∑F = - W + T [upward motion is taken as positive. hence -W and +T]
Substitute ∑F = - W + T into equation (i) as follows;
- W + T = m x a (ii)
From the question;
* Weight (W) of the block = 45.7N
=> mass (m) of the block = W / g = 45.7 / 10 [Taking g = 10m/s²]
=> m = 4.57 kg
* acceleration (a) = 1.50m/s²
Substitute these values into equation (ii) as follows;
- 45.7 + T = 4.57 x 1.50
- 45.7 + T = 6.855
Solve for T;
T = 6.855 + 45.7
T = 52.555 N
Therefore, the tension in the rope is 52.555 N