Answer:
Explanation:
The daily energy consumption of the household is:
The needed area of solar panel to power the household is:
A 950-kg car strikes a huge spring at a speed of 22m/s (fig. 11-54), compressing the spring 5.0m. (a) what is the spring stiffne
1 answer:
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Answer:
345 N
Explanation:
Given:
Normal weight of Rachel (mg) = 690 N
Case 1: Upward motion of elevator
Given:
Acceleration of elevator (a) = 0.25 g
The scale reading is given by the normal force acting on Rachel. Let N₁ be the normal force.
So, the net force acting on Rachel is given as:
Now, from Newton's second law:
Case 2: Downward motion of elevator
Given:
Acceleration of elevator (a) = 0.25 g
The scale reading is given by the normal force acting on Rachel. Let N₂ be the normal force.
So, the net force acting on Rachel is given as:
Now, from Newton's second law:
Now, the difference in the scale reading is obtained by subtracting equation (2) from equation (1). This gives,
Therefore, the difference between the up and down scale readings is 345 N.
Answer:
Explanation:
Momentum is a vector quantity that represents the "amount of motion" of an object.
Mathematically, the momentum of an object is given by
where
m is the mass of the object
v is the velocity
Since momentum is a vector, it also has a direction, which is the same as the velocity.
Therefore, if we have two objects, the total momentum of the two objects will be obtained from the vector sum of the individual momenta of the two objects.
In this problem we have:
is the momentum of object A
is the momentum of object B
Therefore, the total momentum of objects A and B can be obtained by adding each components of A to the corresponding component of B, so:
So the total initial momentum is