answer
567000 J
formula
the formula for power is P = ΔE/Δt
rearrange for energy to get ΔE = PΔt
P is power in watts (W)
E is energy in joules (J)
t is time in seconds (s)
values
P = 315 W
t = 30 minutes = 30 * 60 = 1800 s
plug in values
ΔE = PΔt
ΔE = 315 * 1800
ΔE = 567000 J
Answer:
t=12600ns
Explanation:
We use the relation between distance and velocity to solve this problem:
d=v*t
d=3.8km=3.8*10^3m
v=3*10^8 m/s^2 light's speed
we solve to find t:
t=d/v=(3.8*10^3)/(3*10^8)=1.26*10^(-5)s=12600*10^(-9)s=12600ns
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:
It is safer to endure an explosion on land rather than in water. So it is better to take cover on lanad.
The correct answer is letter B. 13.7 millimeters. <span>An object is located 51 millimeters from a diverging lens. The object has a height of 13 millimeters and the image height is 3.5 millimeters.
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mi / mo = hi / ho
mi / 51 = 3.5 /13
178.5 = 13 mi
mi = 13.7 mm