The initial velocity is the speed and direction of the car at the beginning
of the event.

You just said that the car "starts at zero". You might mean that it starts at
"location zero". But then you go on to tell us its speed after 10 minutes,
so it sounds like the "zero" at which it starts is zero speed.

In that case, its initial velocity is zero.

6 0

3 years ago

alpha decay is a nuclear decay in which a helium nucleus is emitted. If the helium nucleus has a mass of 6.8*10^-27 kg and is gi

almond37 [142]

Answer:

16520931.465 m/s

Explanation:

K = Kinetic energy = 5.8 MeV

m = Mass of nucleus = $6.8\times 10^{-27}\ kg$

Speed of a particle is given by

$v=\sqrt{\dfrac{2K}{m}}\\\Rightarrow v=\sqrt{\dfrac{2\times 5.8\times 10^6\times 1.6\times 10^{-19}}{6.8\times 10^{-27}}}\\\Rightarrow v=16520931.465\ m/s$

The velocity is 16520931.465 m/s

4 0

3 years ago

How many LEDs must be combined into one light source to give a total of 3.8 W of visible-light output (comparable to the light o

notka56 [123]

Answer:

This is an incomplete question. The complete question is --

An individual white LED (light-emitting diode) has an efficiency of 20% and uses 1.0 W of electric power.

How many LEDs must be combined into one light source to give a total of 3.8W of visible-light output (comparable to the light output of a 100W incandescent bulb)?

And the answer is --

19 LEDs

Explanation:

The full form of LED is Light emitting diode.

It is given that the efficiency of the LED bulb is 20 %

1 LED uses power = 1 W

So the output power of 1 LED = 0.2 W

We need to find the power required to give a 3.8 W light.

Power required for 3.8 W = Number of LEDs required = (total required power / power required for 1 LED )

= 3.8 / 0.2

= 19

Therefore, the number of LEDs required is 19.

4 0

3 years ago