Answer:
mass × accleration due to gravity = force
10×9.8
= 98 N
Explanation:
hope it helps you
Answer:19.32 m/s
Explanation:
Given
initial speed of car(u)=4.92 m/s
acceleration(a)=
Speed of car after 4.5 s
using equation of motion
v=u+at
v=19.32 m/s
Displacement of the car after 4.5 s
s=54.54 m
Answer:
The change in momentum of the two cars is equal and opposite
Explanation:
The change in momentum of an object is given by:
where
m is the mass of the object
is the change in velocity
According to Newton Laws of motion, the force experienced by an object is equal to the rate of change of its momentum:
(1)
where
is the time interval during which the force is applied.
According to Newton's third law of motion, the force exerted by vehicle 1 on vehicle 2 during the collision is equal and opposite to the force exerted by vehicle 2 on vehicle 1. Therefore, we can write:
Using (1), we can rewrite this as:
Where are the changes in momentum of car 1 and 2, and is the duration of the collision. Simplifying, we get
So, the change in momentum of the two cars is equal and opposite.
Answer:
b. AG, work function=4.74eV
Explanation:
Ultraviolet light starts at the end of the visible light spectrum, where violet light ends:
(wavelength of lowest-energy ultraviolet light)
So, the lowest energy of ultraviolet light can be found by using the formula
where
h is the Planck constant
c is the speed of light
Substituting,
And keeping in mind that
This energy converted into electronvolts is
The work function of a metal is the minimum energy needed to extract a photoelectron from the surface of the metal. Therefore, the metals that exhibit photoelectric effect are the ones whose work function is larger than the energy we found previously, so:
b. AG, work function=4.74eV
Because for all the other metals, visible light will be enough to extract photoelectrons.