The intensity of sunlight hitting the surface of the earth on a cloudy day is about 0.50 kw/m2 assuming your pupil can close dow
1 answer:
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Good morning.
Lets make the movement function for the dog and cat.
The cat has a start position of1.5 m(the middle of the room), with an initial speed of 0 and acceleration of 0.85 m/s².
The dog has a start position of 0, an initial speed of 1.5 m/s and acceleration of -0.1 m/s².
<u>Cat:</u>
<u>Dog:</u>
Let's see if the dog reach the cat. Physically, it means
Now we solve for <em>t</em>:
We have a negative Delta. Therefore, there is no instant t when the dog reaches the cat.
Lets make the movement function for the dog and cat.
The cat has a start position of1.5 m(the middle of the room), with an initial speed of 0 and acceleration of 0.85 m/s².
The dog has a start position of 0, an initial speed of 1.5 m/s and acceleration of -0.1 m/s².
<u>Cat:</u>
<u>Dog:</u>
Let's see if the dog reach the cat. Physically, it means
Now we solve for <em>t</em>:
We have a negative Delta. Therefore, there is no instant t when the dog reaches the cat.
Answer:
Explanation:
An object is at rest along a slope if the net force acting on it is zero. The equation of the forces along the direction parallel to the slope is:
(1)
where
is the component of the weight parallel to the slope, with m being the mass of the object, g the acceleration of gravity,
the angle of the slope
is the frictional force, with
being the coefficient of friction and R the normal reaction of the incline
The equation of the forces along the direction perpendicular to the slope is
where
R is the normal reaction
is the component of the weight perpendicular to the slope
Solving for R,
And substituting into (1)
Re-arranging the equation,
This the condition at which the equilibrium holds: when the tangent of the angle becomes larger than the value of , the force of friction is no longer able to balance the component of the weight parallel to the slope, and so the object starts sliding down.