Answer:
21 km/hr
Explanation:
Divide 42 by 2 because 30 mins is half an hr
Answer:
doing her homework/finding time to do important things
b. Float
Explanation:
A liquid with a specific gravity of less than one with combined with water will definitely float upon it.
Specific gravity is also known as relative density. It is the density of a substance compared to the density of water.
When a substance has higher density than water it will sink in it.
A substance with a density lower than that of water will float and stay on top of it.
Learn more:
Density brainly.com/question/5055270
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The answer to your question is D solid
Answer:
a) 0 N
b) 6 N
c) So the applied force must be greater than 16 newton.
Explanation:
Given:
weight of the box,
coefficient of static friction between the box and horizontal surface,
coefficient of kinetic friction,
Here the given value of coefficient of static friction is understated, it is given here as the maximum value of the coefficient of static friction which is variable according to the applied force on the body tending to promote a relative motion between the surfaces.
a)
When no horizontal force is applied on the box and the box is at rest then according to the Newton's first law of motion the box tends to have its initial state of rest and all the forces acting on the box are in equilibrium. Hence no frictional force acts on the box.
b)
When a monkey applies a force of 6 N on the box and it does not move then the contact surface friction also applies the equal amount of force in the opposite direction which balances out the applied force, this will happens upto the maximum coefficient of friction which is stated as coefficient of static friction in the question.
c)
the minimum force required to move the box must be greater than the maximum force of friction which resists the relative motion.
We have the maximum frictional force as:
So the applied force must be greater than 16 newton.