Explain how mirrors can produce images that are larger or smaller than life size, as well as upright or inverted

Answers

Answer 1
Answer:

Answer:

1) When d_(o) < d_(i) (hence  d_(o) < f ) and they are both in front of the mirror (positive), the image will be larger and inverted

2) When d_(o) > d_(i) (and d_(o) < f ) such that they are both positive (in front of the mirror), the image will be smaller and inverted

3) When the image is behind the mirror, for convex mirrors and the object is in front the image will be uptight. The magnification of the image will be the ratio of the image distance to the object distance from the mirror

Explanation:

The position of an object in front of a concave mirror of radius of curvature, R, determines the size and orientation of the image of the object as illustrated in the mirror equation

(1)/(f)=(1)/(d_(o)) + (1)/(d_(i))

Magnification, \, m = (h_(i))/(h_(o)) = -(d_(i))/(d_(o))

Where:

f = Focal length of the mirror = R/2

d_(i) = Image distance from the mirror

d_(o) = Object distance from the mirror

h_(i) = Image height

h_(o) = Object height

d_(o) is positive for an object placed in front of the mirror and negative for an object placed behind the mirror

d_(i) is positive for an image formed in front of the mirror and negative for an image formed behind the mirror

m is positive when the orientation of the image and the object is the same

m is negative when the orientation of the image and the object is inverted

f and R are positive in the situation where the center of curvature is located in front of the mirror (concave mirrors) and f and R are negative in the situation where the center of curvature is located behind the mirror (convex mirrors)

∴ When d_(o) < d_(i) (hence  d_(o) < f ) and they are both in front of the mirror (positive), the image will be larger and inverted

When d_(o) > d_(i) (and d_(o) < f ) such that they are both positive (in front of the mirror), the image will be smaller and inverted

When the image is behind the mirror, for convex mirrors and the object is in front the image will be uptight. The magnification of the image will be the ratio of the image distance to the object distance from the mirror.


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True or false day and night are caused by earths rotation

Answers

true because it is day in one part and night in the other
the answer is true! as the earth rotates it also orbits around the sun causing day and night.

How do you find cumulative effect of two or more forces acting on an object

Answers

The cumulative effect, or the resultant, of two or more forces is obtained by resolving the forces. This is done by addition if the forces act in the same direction through the same point and by subtraction if the forces act in opposite direcitons through the same point. However, if the forces are placed at an angle to one another, they must be resolved into their consituent x and y (and z if necessary) components and then their resultant is calculated.

Answer:

Cumulative effect of two or more force can be found using Vector sum of all forces

Explanation:

Force is a vector quantity and in order to find the resultant of two or more forces we have to use the concept of vector addition

here we know that vector addition rule is given as

F_(net) = √(F_1^2 + F_2^2 + 2F_1F_2cos\theta)

here we know that

\theta = angle between two forces

so using this equation we can find the cumulative effect of two forces which are inclined at an angle with respect to each other

A 2.3 kg block is pulled across a friction-free horizontal surface, stretching a spring that has a spring constant of 18 N/m. At the moment it is released, the block accelerates at 0.27 m/s2. What is the net force that the spring exerts on the block?
N
How far was the spring stretched at the moment it was released?

Answers

To find the force on the block, use Newton #1:  F = m A

Force = (2.3 kg) x (0.27 m/s²)

Force = (2.3 x 0.27) kg-m/s²

Force = 0.621 Newton

The spring stretches 1 meter when to pull with 18 N of force.

To pull with only 0.621 N of force, it only has to stretch (0.621/18) of a meter.  That's 0.0345 meter, or 3.45 cm .

Which of the following is powered by nuclear energy?A) aircraft
B) automobiles
C) trains
D) submarines

Answers


Submarines. Work on nuclear marine propulsion in the 1940's, and the first reactor started up in the USA in 1953.
It is only submarines among the options that are powered by Nuclear Energy.
D).

Why do faults often occur along plate boundaries?

Answers

Earthquakes can also occur far from the edges of plates, along faults. Faults are cracks in the earth where sections of a plate (or two plates) are moving in different directions. Faults are caused by all that bumping and sliding the plates do. They are more common near the edges of the plates.