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Charge is placed on a metallic sphere which is surrounded by air. If the radius of the sphere is 15 cm, how much charge can be placed on the sphere before the air near the sphere suffers electric breakdown? The critical electric field strength that leads to breakdown in air is 3 x 10^6 N/C
2. A parallel plate capacitor has plates 5cm2 and 0.1mm apart. Find its capacitance (a) in air; (b) with mica of κ=6 between plates. 3. How much energy is stored in a 50pF capacitor when it is charged to a potential difference of 200V?
3. How much energy is stored in a 50pF capacitor when it is charged to a potential difference of 200V?
4. A parallel plate capacitor has a square plate of side 6.0 cm and separated by a
distance of 2 mm. (a) Calculate the capacitance of this capacitor. (b) If a 15 V battery is connected to the capacitor, what is the charge stored in any of the plates?
(The value of 𝜀0 = 8.85 𝑥 10^-¹²𝑁𝑚²/𝐶²)
A 10-Newton object moves to the left at 1 m/s. Its kinetic energy is approximately Joules if you double the speed.
a. 0.5 b. 1 c. 10 d. 20
1What is the work done by GRAVITY if a 50kg block is pushed along a 4m horizontal track?
a. 1960 Joules
b. Zero Joules
c. 13 Joule
d. 540 joules
7. A 25 kg child slides down a 6.5 m playground slide that makes an angle of 20o with horizontal. The coefficient of kinetic friction between slide and child is 0.10.
Find the following:
a. What kind of energy is present on the child at the top of the slide? At the bottom of the slide?
b. How much potential energy does the child have?
c. How much kinetic energy does the child have?
d. How much energy is transferred to thermal energy?
e. If she starts at the top with A SPEED OF 0.50 m/s, what is her speed at the bottom?
A 200 g object is whirled in a horizontal circle with a cord of radius 1.2 m at 3rev/s. The work done in doing this is.
Which requires more work: (Body A) lifting a 50.0 kg crate a vertical distance of 2.0 meters; (Body B) lifting a 25.0 kg crate a vertical distance of 4.0 meters?
Find the sum of following vector 20.0m directed east, 12.0m directed 40° w of n and 15.0m directed 35° s of e. a.) by component method and b.) graphical method using the space of the yellow paper as the scale. Represent the given vectors and resultant’s and compare the resultant
A conductor of length l and diameter d has the value of resistance r and resistivity rho at a given temperature . if the same material for the conductor is used but of length 0.25 l and diameter 0.5d , comment on the values of resistance and resistivity
A car starts from the rest covers a distanc 500m while accelerating uniformly at 10m/s2.
