Q1]. An electric field has a magnitude of 400 N/C and makes an angle
60
o
with the perpendicular to the surface of a flat surface of dimensions 30 cm by 20 cm. Calculate the electric flux through the surface.
Q2. Two large horizontal, parallel metal plates are 2.0 cm apart in air and the upper plate is maintained at a positive potential relative to the lower plate so that field strength between them is
2.5x10^5 vm^1.
An electron is released from rest at the lower plate. What is its speed on reaching the upper plate? [e=1.6x10^19 ;me=9.1x10^31kg].
Answer:
An electric field has a magnitude of 400 N/C and makes an angle
60
o
with the perpendicular to the surface of a flat surface of dimensions 30 cm by 20 cm. Calculate the electric flux through the surface.
Explanation:
An ant is crawling along a yardstick that is pointed with the 0-inch mark to the east and the 36-inch mark to the west. It starts at the 17-inch mark, crawls to the 21-inch mark, then moves to the 8-inch mark. What was the total distance the ant traveled?
The total distance that is traveled is 12 inches.
What is the distance?We know that distance is a scalar quantity. The term distance only has to do with the difference between two points. The direction is not taken into cognizance when we are discussing the distance that has been covered.
As we have said that distance is a scalar quantity, it the follows that the process of obtaining the total distance can only be algebraic given that we could directly add all the distance covered by the ant in order to obtain the total distance of the ant.
Now, we can see that the ant starts at the 17-inch mark, crawls to the 21-inch mark, then moves to the 8-inch mark. The total distance covered is obtained from; (21 - 17) + 8 = 12 inches.
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Chance drives her scooter 7 km north. She stops for lunch and then drives 5 km east. She spends 2 hours total. What her distance? displacement? average speed? average velocity?
We know that the distance is the difference between two points. The distance covered is a scalar quantity hence we can obtain the total speed algebraically. The displacement is a vector quantity hence we must obtain it geometrically.
Total distance = 7 km + 5 km = 12 km
Total displacement = √7^2 + 5^2 = 8.6 km East of North
Average speed = 12 km/ 2 hours = 6 Km/hr
Average velocity = 8.6 km East of North/2 hours = 4.3Km/hr East of North
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While John is traveling along a straight interstate highway, he notices that the mile marker reads 252km. John travels until he reaches the 145km marker and then retraces his path to the 177km marker. What is John's resultant displacement from the 252km marker? Answer in units of km.
John's resultant displacement from the 252km marker when traveling along a straight interstate highway is 75 km
Δx = [tex]x_{2}[/tex] - [tex]x_{1}[/tex]
Δx = Displacement
[tex]x_{2}[/tex] = Final position
[tex]x_{1}[/tex] = Initial position
[tex]x_{2}[/tex] = 177 km
[tex]x_{1}[/tex] = 252 km
Δx = 177 - 252
Δx = - 75 km
Displacement is the shortest distance between initial and final positions. It is denoted using Δx. Since, it is a measure of length, its unit is usually meter.
Therefore, John's resultant displacement from the 252km marker when traveling along a straight interstate highway is -75 km
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Which process is a change from gas to liquid?
OA. Freezing
B. Melting
OC. Vaporization
OD. Condensation
Answer:
Condensation
Explanation:
When water vapour (gas) is cooled it undergoes CONDENSATION to form water(liquid).
In a biathalon race you first ride a bicycle at an average speed of 19.1 mi/h for 18.5 miles, then you must run for another 5.5 miles. With what average speed, in miles per hour, must you run if your average speed for the entire race is to be 14.5 mi/h?
The average speed you must run is 7.97 mph.
What is average speed?The average speed of an object is the ratio of total distance traveled by the object to
Average speed = total distance / total time of motion
Total time of motion = total distance / average speed
total time = (18.5 + 5.5) / (14.5)
total time = 1.66 hours
time taken during the bicycle ridet1 = 18.5 / 19.1
t1 = 0.97 hour
time taken during the runt2 = 1.66 hr - 0.97 hr
t2 = 0.69 hr
Average speed during the runv = 5.5 miles /0.69 hr
v = 7.97 mph
Thus, the average speed you must run is 7.97 mph.
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