Because of BOMDAS, you do the multiplication first.
(3.0x10) - 4 - (1.7x10) - 6
= 30 - 4 - 17 - 6
= 3
Answer:
(a) ωM=ωA
(b) vA = (0.625)vM
Explanation:
The tangential velocity of the body is calculated by the following formula:
v = ω*R Formula (1)
where:
v is the tangential speed of the body in feet over second (ft/s)
ω is the angular speed in radians over second (rad/s)
R is the radius of the the body in the circular path in meters (m)
(a) What is Mary's angular speed ωM compared to that of Alex's angular speed ωA
The angular speed of Mary and Alex is determined by the angular speed of the carousel ( ωC),therefore it is the same for both:
ωM=ωC , ωA=ωC
ωM=ωA
(b) What is Mary's tangential speed vM compared to that of Alex's tangential speed vA?
Data:
RM = 8 ft : Mary radio
RA = 5 ft : Alex radio
We apply the formula (1)
v = ω*R
vM = ωC *8 : Mary's tangential speed
vA = ωC *5 : Alex's tangential speed
We establish the relationship between vA and vM like this:
vA/vM = (ωC*5) / (ωC*8)
We cancel ωC
vA = (5/8)vM
vA = (0.625)vM
Answer:
This is green light
Explanation:
According to the photoelectric effect, the maximum kinetic energy of an photoelectron is given by:
Here, E is the energy of the photon and W is the minimum energy required to remove an electron from the surface of the metal, W is defined as:
The Planck – Einstein relation states that the energy of a photon is equal to its frequency multiplied by the planck constant:
Recall that . Replacing (3) and (2) in (1):
Solving for :
This is green light
Answer:
Add Ff from Fa
Explanation:
Fnet = sum of all force
horizontal net force = Ff + Fa