Question

From a copper plate with a thickness of 2 mm, a cylinder with an
outer radius of 0.25 m is made. On the cylinder, a cover of iron is
placed which precisely covers the cylinder completely. How much
should the temperature be increased for the lid to fall into the
cylinder?

Answer #1

A ring made from aluminum has an inner radius of 2.50000 cm and
an outer radius of 3.50000 cm, giving the ring a thickness of
1.00000 cm. The thermal expansion coefficient of aluminum is 23.0 ⨯
10-6/°C. If the temperature of the ring is increased from 20.0°C to
75.0°C, by how much does the thickness of the ring change? (answer
in cm)

A slab of copper of thickness b = 1.190 mm is thrust into a
parallel-plate capacitor of C = 2.00×10-11 F of gap d = 5.0 mm, as
shown in the figure; it is centered exactly halfway between the
plates. How much work is done on the slab as it is inserted? Not
sure if this info is helpful but the capacitance after the slab is
introduced is calculated to be 2.62×10-11 F

A plate of length 30 mm in the direction of the flow, a
width of 45 mm and thickness of 1mm, has a surface temperature of
78oC is placed in a stream of air at a temperature of
30oC and velocity of 3.5m/s . Calculate:
The heat loss from the top and bottom of the
plate
The heat loss from a cylinder 5cm long and has the same
volume as the plate and placed across the flow.
for air: ν=...

The 7-mm-thick base plate of an iron is made of an aluminum
alloy (? = 2,700 kgm-3; c = 950 Jkg-1K-1; k = 200 Wm-1K-1; ? =
0.8), and has outer surface area of 0.04 m2, perimeter of 0.7 m,
and maximum length of 0.3 m. An electrical resistance heater
applies a uniform heat flux of 12.5 kWm-2 to the inner surface of
the base plate when the iron is turned on. The outer surface of the
base plate is...

Consider a parallel-plate capacitor constructed from two
circular metal plates of radius R. The plates are separated by a
distance of 1.8 mm. (a) What radius must the plates have if the
capacitance of this capacitor is to be 2.6 µF? m (b) If the
separation between the plates is decreased, should the radius of
the plates be increased or decreased to maintain a capacitance of
2.6 µF? increased decreased Explain. This answer has not been
graded yet. (c) Find...

A parallel-plate capacitor made of half-circular plates of
radius 10 cm separated by 1.50 mm is charged to a potential
difference of 600 volts by a battery. Then a sheet of tantalum
pentoxide is pushed between the plates, completely filling the gap
between them. How much additional charge flows from the battery to
one of the plates when the tantalum pentoxide is inserted?
Dielectric constant for tantalum pentoxide: 25

A parallel-plate capacitor made of half-circular plates of
radius 10 cm separated by 1.50 mm is charged to a potential
difference of 600 volts by a battery. Then a sheet of tantalum
pentoxide is pushed between the plates, completely filling the gap
between them. How much additional charge flows from the battery to
one of the plates when the tantalum pentoxide is inserted?
Dielectric constant for some materials: tantalum pentoxide 25.

A parallel-plate capacitor made of half-circular plates of
radius 10 cm separated by 1.50 mm is charged to a potential
difference of 600 volts by a battery. Then a sheet of tantalum
pentoxide is pushed between the plates, completely filling the gap
between them. How much additional charge flows from the battery to
one of the plates when the tantalum pentoxide is inserted?
Dielectric constant for some materials: mylar 3.1 polyethylene 2.6
polyvinyldifluoride 11. tantalum pentoxide 25. Teflon 2.1

A space probe (mass m) is designed to explore the outer edges of
the solar system. It is propelled by a solar sail, which is made of
a large circular sheet of highly reflective fabric. Assume the sun
radiated with power P.
1. How much could the propulsion be increased if the radius of
the sail were three times larger?
2. Jupiter is about five times as far from the sun as the earth.
When the probe reaches jupiter, how...

Metal sphere A, with a radius RA = 2.00 mm, is fixed at the
origin. A smaller metal sphere B (mB = 10.0 grams, RB = 1.00 mm) is
tethered to sphere A by a thin, taut conducting string that is 1.00
m long, connecting the surface of A to the surface of B. A total
charge of 9.00 C is placed on the connected spheres.
(a) Assuming no charge remains on the thin string, determine how
the 9.00 C...

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