Answer:
Explanation:
Given the mass of the crate = 10kg
initial speed of the crate = 1.50m/s
pulling force F = 100N
angle of inclination = 20°
Coefficient of kinetic friction = 0.400
Distance traveled by the crate d = 5.00m
Application of newton's second law perpendicular to the inclined plane is used and the detailed calculation is as shown in the attached file.
Answer:
In a nutshell, a scientific law predicts what happens while other laws devised by people usually proposes why certain things happen.
Explanation:
A scientific law is one that predicts the results of certain initial conditions. In order words, it predicts what will happen when certain conditions are fulfilled. A very good example is Newton's 3 laws of motion where like the third law which says to every action, there is an equal and opposite reaction or like in the first law which says a body at rest will remain at rest unless it is acted upon by an external force.
Whereas, other laws devised by people usually provides the most logical explanation as to why things happen the way they do. For example explaining why some children develop certain peculiar health issues when they are newly born.
In a nutshell, a scientific law predicts what happens while other laws devised by people usually proposes why certain things happen.
The mass would stay the same, but the weight would be only 16.5%.
Explanation:
Mass is the amount of "matter" in an object, which stays the same everywhere. Weight is the force acting on an object by gravity, which changes depending on nearby bodies. In this case, weight on the moon is 16.5% of that on Earth.
Answer:
The Reynolds numbers for flow in the fire hose.
Explanation:
Given that,
Diameter = 6.40 cm
Rate of flow = 40.0 L/s
Pressure
We need to calculate the Reynolds numbers for flow in the fire hose
Using formula of rate of flow
Where, Q = rate of flow
A = area of cross section
Put the value into the formula
We need to calculate the Reynolds number
Using formula of the Reynolds number
Where, =viscosity of fluid
=density of fluid
Put the value into the formula
Hence, The Reynolds numbers for flow in the fire hose.
Answer: a) 31.86 *10^-12 C=31.86 pC; b) 18 V
Explanation: In order to explain this problem we have to consider the expression a parallel plates capacitor,which is given by:
C=Q/V where C is equal to C=εo*A/d where A and D are the area and the separation between the plates.
also we have
Q=C*V=ε(o*A/d)*V=(8.85*10^-12*0.02*0.02/1*10^-3)*9=31.86*10^-12 C=31.86pC
Then if the plates apart to a new spacing of 2.0 mm the new capacitance is equal
Cnew=εo*A/2*d so Cnew =Cinitial/2
then Cnew =Q/Vnew (Q is constant after disconnection to the battery)
Finally Vnew= Q/(Cinitial/2)= 2*(Q/Cinitial)= 2*Vinitial= 2*9=18V