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A 1.5 N stone is thrown vertically upward with an initial speed of 15 m/s. Calculate
a. P.E at the maximum height
b. K.E at the instant it will strike the ground
c. P.E after 1 s
d. K.E after 1 s
A pump Efis water from a lake to a large tank: 20 m schove the lake. How much work against gravity does the pump do as it transfers 5.0 m² of water to the tank? One cubic meter of water has a mass of 1000 kg.
A 0.25-hp motor is used to lift a load at the rate of 5.0 cm/s. How great a load can it lift at this constant speed?
On your cousin’s wedding day you leave for the church 30.0 min before the ceremony is to begins, which should leave plenty of time since the church is only 40.0 km away. On the way, however, you have to make an unanticipated stop because of road construction work. As a result, your average speed for the first 10 min is only 15.0 km/h.
What average speed do you need to have on the remainder of the trip to get you to the church on time?
3. Three capacitors with capacitances 5 μF, 10 μF and 15 μF are connected in parallel. Find the capacitance of the combination. If they are connected to a battery of 240 V, find the charge in each capacitor.
4. Three capacitors with capacitances 4 μF, 8 μF, and 12 μF are connected in series. A voltage of 400 V is applied to the combination. (a) Find the charge in each capacitor. (b) What is the voltage across each capacitor?
with solution thank you!
1. Find the charge stored in a capacitor with a capacitance of 50 μF and a potential difference of 10 V.
2. A 5 μF capacitor is parallel with a 10 μF capacitor. Connected is series with this combination is another 5 μF capacitor. A voltage of 120 V is applied to the whole combination. Find the charge stored in each capacitor and the voltage across each capacitor.
with solution thank you!
derive the expression for electric potential of a line charge
While repairing an electric bulb socket, an electrician gets a mild shock when a
current of 0.005 A passes through him. The same electrician is killed by a current of 0.15 A when he turned on an electric bulb while taking a bath. The voltage in each situation is equal to 120 V. Find the resistance of the electrician in each situation.
1. Two electrons are separated by a distance of 5.6×10^-11 m in air.
a. Find the magnitude of the electrical force one electron exerts on the other. Is this force attractive or repulsive?
b. Find the magnitude of the gravitational force one electron exerts on the other. Is this force attractive or repulsive?
Neutron stars are some of the densest objects in the universe. They form during supernova explosions and are very small compared to other astronomical objects. You can assume 5 x 1017 kg/m3 as the average density of a neutron star. The Earth has a total mass of about 5.97 x 1024 kg. What would be the diameter of the Earth if it had the density of a neutron star?
