Complete Question
An electron is accelerated by a 5.9 kV potential difference. das (sd38882) – Homework #9 – yu – (44120) 3 The charge on an electron is 1.60218 × 10−19 C and its mass is 9.10939 × 10−31 kg. How strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.4 cm?
Answer:
The magnetic field strength is 
Explanation:
The work done by the potential difference on the electron is related to the kinetic energy of the electron by this mathematical expression
Making v the subject
![v = \sqrt{[\frac{2 \Delta V * q }{m}] }](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B%5B%5Cfrac%7B2%20%5CDelta%20V%20%2A%20q%20%7D%7Bm%7D%5D%20%7D)
Where m is the mass of electron
v is the velocity of electron
q charge on electron
is the potential difference
Substituting values
![v = \sqrt{\frac{2 * 5.9 *10^3 * 1.60218*10^{-19} }{9.10939 *10^{-31]} }](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B%5Cfrac%7B2%20%2A%205.9%20%2A10%5E3%20%2A%201.60218%2A10%5E%7B-19%7D%20%7D%7B9.10939%20%2A10%5E%7B-31%5D%7D%20%7D)
f
For the electron to move in a circular path the magnetic force[
] must be equal to the centripetal force[
] and this is mathematically represented as
making B the subject
r is the radius with a value = 5.4cm = 
Substituting values
The answer is c. The amount of matter in an object is the concentration of the atoms inside. This can also be called density. Weight depends on density because weight = 
.
Answer:
The horizontal displacement is 
Explanation:
From the question we are told that
The angle at which the string is maintained is 
The length of string reeled in is 
Using the SOHCAHTOA formula
We have that the hypotenuse(Hyp) is l = 152
Hence the horizontal displacement of the kite which is the Adjacent(Adj) can be evaluated as
substituting values
=>
Answer:
20m/s
Explanation:
Given parameters:
Distance of throw = 50m
Time = 3s
Unknown:
Average speed = ?
Solution:
Average speed is distance divided by time;
Average speed = 
Insert the parameters and solve;
Average speed = 
= 16.66667m/s = 20m/s
A thermostat is a switch that operates itself when the temperature
goes above or below a temperature that the user can set.
-- Before you go to bed, you set the thermostat for 65° .
If the temperature in the house goes below 65° during the night,
the thermostat turns on the furnace, and keeps it running until
the house warms up to 65°. Then it shuts the furnace off.
-- After breakfast, you set the thermostat for 75°.
If the temperature in the house goes above 75°, during the day,
the thermostat turns on the air conditioner, and keeps it running until
the house cools down to 75°. Then it shuts the air conditioner off.
-- On Sunday morning, you put the slow cooker on the kitchen counter,
and you throw in a big roast, a sliced onion, some baby carrots, some
sliced potatoes, some vegetable stock, salt, pepper, garlic, chili powder,
and tomato paste. Then you put the cover on, turn the power on, and
set the slow cooker to "LOW". The heater in the slow cooker turns on.
Whenever the temperature in the crock gets higher than 160°, the
thermostat in the slow cooker turns off the heater, and keeps it off
until the crock cools down to 160°. Then the thermostat turns the
heater on again.
By dinner time, you have a hot, juicy, scrumptious pot roast, ready
to eat. It's not too hot, not too cold, not too tough, not dried out, and
it melts in your mouth.
You're still thinking about it when you go to bed, and your mom gives you
a slice to take to school for your lunch on Monday.
