Answer:
80.4 N
Explanation:
As the block is at rest on the slope, it means that all the forces acting on it are balanced.
We are only interested in the forces that act on the block along the direction perpendicular to the slope. Along this direction, we have two forces acting on the block:
- The normal reaction N (contact force), upward
- The component of the weight of the block, 
, downward, where m is the mass of the block, g is the gravitational acceleration and 
is the angle of the incline
Since the block is in equilibrium along this direction, the two forces must balance each other, so they must be equal in magnitude:
And by substituting the numbers into the equation, we find the size of the contact force normal to the slope:
Answer:
The tensile stress on the wire is 550 MPa.
Explanation:
Given;
Radius of copper wire, R = 3.5 mm
extension of the copper wire, e = 5.0×10⁻³ L
L is the original length of the copper wire,
Young's modulus for copper, Y = 11×10¹⁰Pa.
Young's modulus, Y is given as the ratio of tensile stress to tensile strain, measured in the same unit as Young's modulus.
Therefore, the tensile stress on the wire is 550 MPa.
The power source its getting usually determines its voltage.
Answer:The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener.
As the source of sound waves approaches a listener, the sound waves get closer together, increasing their frequency and the pitch of the sound. The opposite happens when the source of sound waves moves away from the listener.
Explanation:
Answer:
814.62 million kilometers
Explanation:
eccentricity of elliptical orbit =0.048
Let semi major axis of elliptical path be a.
From center of the ellipse focus is at a distance = a*eccentricity
Now, closest approach from focus is = a(1-e)
After plugging values = a(1-0.048)=740.52
a=777.31 million kilometers
Maximum distance from sun (apihalian) =a+a*e =a(1+e)
= 777.31(1+0.048)
=814.62 million kilometers
