Answer:
v = 42.33 m/s
Explanation:
The time difference between two pulses that are emitted by Police is observed in the interval
now the speed of the electromagnetic wave is given as
now the distance traveled by them
so distance of speeding vehicle covered for round trip of wave is 38.1 m
now for one trip it is given as d = 19.05 m
now the speed of the vehicle is given as
Answer: 16.8 m
Explanation:
The motion of the lemming is a projectile motion, consisting of two independent motions:
- on the horizontal (x) axis, a uniform motion, with constant speed v = 2.87 m/s
- on the vertical (y) axis, an accelerated motion, with constant acceleration (downward)
The lemming lands in the water at x = 5.32 m away from the bas of the cliff, so we can calculate the time it takes to hit the water:
And now, by considering the motion on the vertical direction:
we can find the height of the cliff (h) by requiring that y(t)=0:
The correct answer of this question: 18789.79 watt.
EXPLANATION:
As per the question, the surface area of the log is given as A =
The temperature of the of the surface of the log t = 800
We know that
⇒ 800 degree celsius= 800+273 K
= 1073 K.
Here, K stands for kelvin scale.
We are asked to calculate the thermal power radiation .
The power is defined as the amount of energy released per unit time.
Hence, power is calculated as-
Power P =
=
= 18789.79 watt. [ans]
Here, is the Stefan-Boltzmann constant and T is the absolute temperature of the log.
Answer:
<em>The fringe spacing on a distant diffraction screen will increase.</em>
Explanation:
Blue light has a shorter wavelength than red light, so, changing from blue to red light is basically increasing the wavelength of the light involved in the experiment.
In the double slit experiment, the fringe spacing on a diffraction screen is calculated from the equation below
ω = zλ/d
where ω is the fringe spacing
z is the distance of the slit to the screen
λ is the wavelength of the light used
d is separation or distance between the slits
From the equation, one can see that if other parameters are held constant, <em>increasing the wavelength will lead to an increase in the spacing between the fringes, and hence, changing the light from blue to red light will increase the fringe spacing.</em>