Which question about dogs could be answered through scientific investigation?
a. how loving a pet is an irish terrier?
b. how fast does an australian terrier grow?
c. which type of dog gets along the best with cats?
d. which breed of dog is the cutest to children?
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Ответ:
b
Explanation:
because it is an investigation that shows a hypothesis
Ответ:
The block will not move.
Explanation:
We'll begin by calculating the frictional force. This can be obtained as follow:
Coefficient of friction (µ) = 0.6
Mass of block (m) = 3 Kg
Acceleration due to gravity (g) = 10 m/s²
Normal reaction (R) = mg = 3 × 10 = 30 N
Frictional force (Fբ) =?
Fբ = µR
Fբ = 0.6 × 30
Fբ = 18 N
From the calculations made above, the frictional force of the block is 18 N. Since the frictional force (i.e 18 N) is bigger than the force applied (i.e 14 N), the block will not move.