Answer:
The answer is
A. Incident rays that are parallel to the central axis are dispersed but will be perceived as originating from a point on the near side of the mirror.
Explanation:
The images formed by a convex mirror is virtual, diminished and images are always formed between the Focal point and the pole of the mirror.
Convex mirrors are used as car driving mirrors because they form upright images and also give wider field of view (dispersed) , and notice that in the car driving mirrors there is a warning "objects appear closer than they are "
Which explains our answer, that images are perceived from a near side
Answer:
30 m/s
Explanation:
Velocity is since we know that the initial velocity is 0, and the acceleration is then we also know that time is 3 seconds it follows that:
No. You have to lose a lot of momentum to slow down enough to survive the impact (obviously depending on the height of the building). In your scenario, you can only transfer that momentum to the chair, by pushing it downward with your legs.
Let's say you jump off a 10 metre tall building and have a mass of 75 kg. You will be travelling at about 14 m/s just before impact, with a momentum of 1050 kgm/s. You want to reduce that momentum to around 750 kgm/s (equivalent to falling from a height of 5 m, which is probably survivable and may leave you able to walk away), so you have to transfer 300 kgm/s of momentum to the chair just by pushing it with your legs. For a 10 kg chair that means accelerating it to 30 m/s (in addition to the 14 m/s velocity the chair and you are already falling at), which is rather difficult.
You'd probably be better off landing on the chair and hoping that the chair breaking absorbs enough of the impact.
Answer:
D. location
Explanation:
The gravitational field strength of Earth is determined by the virtue of the location within the Earth's gravitational field.
That's why all objects regardless of their mass, shape, and size free fall towards the Earth with an acceleration equal to the acceleration at that location in the absence of air resistance.
According to the gravitational force between two bodies, the force experienced by one body due to the other is independent of its own mass.
The gravitational force is given by equation
F = GMm/r²
If F is the force acting on the smaller body of mass 'm', then
F = ma
Therefore, the equation becomes,
ma = GMm/r²
a = GM/r²
The value of 'a' changes with respect to the value of 'r' such that if 'r' is the radius of the Earth, then the acceleration at a height 'h' from Earth surface is given by
a = GM/(r+h)²
Here it is clear that the acceleration at any point is only the inherent property of the Earth itself.
The gravitational field strength of Earth is determined by the virtue of the location within the Earth's gravitational field.
A 60-w power lightbulb uses 0.5 amps of electricity when connected to a 120-v home line.
Calculation:
Provided that,
Power, P = 60 w
Voltage, V = 120 v
We have to find out the current or electricity consumption, I.
We know that Power (P)is equal to the voltage(V) divided by current(I), or
P = VI
⇒I = P/ V [when power is divided by voltage we get current]
⇒I = 60 / 120
⇒I = 0.5 amp
Therefore from the above calculation, it is concluded that when a 60 w bulb is operating on a 120 v line, it consumes 0.5 amp current.
Learn more about power here:
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