Answer:
The Height of a pyramid is 4r.
Explanation:
Explanation is in the following attachments
Select the statements that describe a vector. Check all that apply.
2 answers:
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Answer:
a.) magnitude __49.7__ unit(s)
b.) direction __123.6°_ counterclockwise from the +x axis
Explanation:
Let Vector is v
x-component of Vector v = x = -27.5 units (minus sign indicate that x-component is along the minus x-axis )
y-component of Vector v = y = 41.4 units
Magnitude of v = ?
Direction of v = ?
To find the magnitude of the vector
v =
v =
v = 49.7 units
To find direction
θ = tan⁻¹(y/x)
θ = tan⁻¹(41.4/-27.5)
θ = -56.4°
This Angle is in the clockwise direction with respect to -x axis.
We need to find Angle counterclockwise from the +x axis.
So,
θ = 180° - 56.4°
θ = 123.6°
The given vector is in 2nd quadrant
Answer:
Work done is 1.31 J.
Explanation:
Given:
Length of the ramp (L) = 5.0 mm
Height of the top end (H) = 1.4 mm
Horizontal force applied (F) = 270 N
Work done (W) = ?
We know that,
Work done is equal to the product of force and displacement caused along the line of application of force.
Here, the force acting on the refrigerator is in the horizontal direction while the refrigerator is moving down along the length of the ramp. So, we have to first find the horizontal component of the displacement caused.
Now, consider the triangle ABC representing the given situation. The point A is the top end point of the ramp, AB is the length of the ramp, AC is the vertical displacement of the refrigerator and BC is the horizontal displacement of the refrigerator.
Using Pythagoras theorem,
Now, force applied on the refrigerator is in the direction opposite to the horizontal component of displacement. So, work is negative.
Work = Force × Horizontal displacement
Therefore, work done is 1.31 J.
