If 200 g of ice at 0°C and 50 g of steam at 100°C interact thermally in a well-insulated container. The final state of the system will be;
( is loved it and got Tf= 64C ) ( so please choose an answer from the following multiple choices )
(a) A water steam mixture at 100°C
(b) Water at a temperature between 0°C and 50°C (c) 0.089 kg
(d) 0.12 kg
(e) A ice-water mixture at 0°C
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a) Identify two attractive forces at work in an atom, and identify the kinds of particles each force acts between.
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A farm truck moves due north with a constant velocity of 12.00 m/s on a limitless horizontal stretch of road. A boy riding on the back of the truck throws a can of soda upward and catches the projectile at the same location on the truck bed, but 19.0 m farther down the road.
(a) In the frame of reference of the truck, at what
angle to the vertical does the boy throw the can?
°
(b) What is the initial speed of the can relative to
the truck?
m/s
(c) What is the shape of the can's trajectory as seen by the boy?
a straight line segment upward and then downwarda
symmetric section of a parabola opening
downward
(d) An observer on the ground watches the boy throw the can and catch it. In this observer's ground frame of reference, describe the shape of the can's path and determine the initial velocity of the can.
a symmetric section of a parabola opening
downward
or
a straight line segment upward and then
downward
m/s north at ° above the horizontal
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Using appropriate fundamental therems of vector calculus derive macroscopic Maxwell's equations from microscopic equations with every detail.
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Describe why some stars, such as white dwarfs and neutron stars become degenerate. What are the two fundamental physics principles that underpin the concept of degeneracy?
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On a scale where the Sun is about the size of a grapefruit (7 centimeters) and the Earth is about 15 meters away, how far away from Earth is the nearest star? A) about 7×10−2 meters. B) about 2×101 meters. C) about 5×103 meters. D) about 5×106 meters. E) There is not enough information to tell.
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COURSE: Material Physics
3. In the process of producing ceramic powder, mesh is often used as a unit of measure for powder. Explain the meaning of the mesh! How do you get powder between 255-400 mesh?
4. Mention the various tests to find out ductile or brittle material! Explain briefly!
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What total capacitances can you make by connecting a 4.14 µF and 8.81 µF capacitor together?
series ____µF
parallel____ µF
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2) A merry-go-round has a radius of 1.75 m and a rotational
inertia of 600 km-m2. A child pushes the merry-go-round with a
constant force of 102 N applied at the edge and parrallel to the
edge. A frictional torque of 32 N.m acts at the axel of the
merry-go-round.
a) What is the torque applied by the child?
b) What is the rotational acceleration of merry-go-round?
c) The child stops pushing after 18 seconds, if merry-go-round had
started from rest how long will it take for the merry-go-round to
stop turning?
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An electric field given by E→ = 1.7î - 1.8(y2 + 8.4)ĵ pierces the Gaussian cube of edge length 0.180 m and positioned as shown in the figure. (The magnitude E is in newtons per coulomb and the position x is in meters.) What is the electric flux through the (a) top face, (b) bottom face, (c) left face, and (d) back face? (e) What is the net electric flux through the cube?
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Blocks A (mass 4.00 kg ) and B (mass 7.00 kg ) move on a frictionless, horizontal surface. Initially, block B is at rest and block A is moving toward it at 4.00 m/s . The blocks are equipped with ideal spring bumpers. The collision is head-on, so all motion before and after the collision is along a straight line. Let +x be the direction of the initial motion of block A.
Find the maximum energy stored in the spring bumpers?
Find the velocity of block A when the energy stored in the spring bumpers is maximum?
Find the velocity of block B when the energy stored in the spring bumpers is maximum?
Find the velocity of block A after they have moved apart?
Find the velocity of B after they have moved apart?
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You shine a laser on a plastic prism made from an unknown material and measure the angles relative to the normal that the light takes both inside and outside the medium. You make a plot of sin ?inside versus sin ?outside for the plastic object and calculate the slope of best-fit line of your plot to be 0.79365 ± 0.05669. What is the index of refraction of the plastic object?
Correct Answer: 1.26 +/- 0.09
How do you get the 0.09 uncertainty?
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A)The mass of the Moon is 7.4 × 1022 kg, its radius is 1.74 × 103 km, and it has no atmosphere. What is the acceleration (in m/s2) due to gravity at the surface of the Moon? (G = 6.67 × 10-11 N ∙ m2/kg2)
B)From what height above the surface of the earth should an object be dropped to initially experience an acceleration of 0.54g? (G = 6.67 × 10-11 N ∙ m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
C)A fairground ride spins its occupants inside a flying saucer-shaped container. If the horizontal circular path the riders follow has an 8.0 m radius, at how many revolutions per minute will the riders be subjected to a centripetal acceleration whose magnitude is 1.5 times that due to gravity?
D)An automobile with 0.260 m radius tires travels 83000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?
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Doppler spectral line broadening is caused by the fact that the velocity of atoms or molecules relative to the observer follows a Maxwell distribution. The effect is dependent on temperature. Hence it serves as a thermometer to determine the temperature of hot gases, such as in distant stars as well as the relative motion of the light source (away or approaching) the Earth observer. Derive the distribution of the intensity of spectral line and show how the line width is related to the temperature.
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