Questions
A satellite is put into an elliptical orbit around the Earth. When the satellite is at...

A satellite is put into an elliptical orbit around the Earth. When the satellite is at its perigee, its nearest point to the Earth, its height above the ground is hp=215.0 km,hp=215.0 km, and it is moving with a speed of vp=8.450 km/s.vp=8.450 km/s. The gravitational constant GG equals 6.67×10−11 m3⋅kg−1⋅s−26.67×10−11 m3·kg−1·s−2 and the mass of Earth equals 5.972×1024 kg.5.972×1024 kg.

When the satellite reaches its apogee, at its farthest point from the Earth, what is its height haha above the ground?

For this problem, choose gravitational potential energy of the satellite to be 00 at an infinite distance from Earth.

In: Physics

A lightning bolt strikes one end of a steel lightning rod, producing a 15300-A current burst...

A lightning bolt strikes one end of a steel lightning rod, producing a 15300-A current burst that lasts for 67 μs . The rod is 2.5 m long and 2.3 cm in diameter, and its other end is connected to the ground by 38 m of 8.5-mm-diameter copper wire.

A) Find the potential difference between the top of the steel rod and the lower end of the copper wire during the current burst.

Express your answer using two significant figures.

B) Find the total energy deposited in the rod and wire by the current burst.

Express your answer using two significant figures.

In: Physics

I can't really understand why two higgs doublets are required in SUSY. From the literature, I...

I can't really understand why two higgs doublets are required in SUSY.

From the literature, I have found opaque explanations that say something along the lines of: the superpotential W must be a holomorphic function of the chiral supermutiplets and thus we need to introduce another chiral supermutiplet.

I also know that this is somehow related to an anomaly cancellation. Can somebody help to make this a bit more clear?

In: Physics

A 8.0-cm-diameter horizontal pipe gradually narrows to 5.0 cm . When water flows through this pipe...

A 8.0-cm-diameter horizontal pipe gradually narrows to 5.0 cm . When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 31.0 kPa and 25.0 kPa , respectively. What is the volume rate of flow?

In: Physics

A sled and rider have a total mass of 49.6 kg. They are on a snowy...

A sled and rider have a total mass of 49.6 kg. They are on a snowy hill accelerating at 0.8g. The coefficient of kinetic friction between the sled and the snow is 0.22. What is the angle of the hill's slope measured upward from the horizontal? You may find a spreadsheet program helpful in answering this question.

In: Physics

A 450-turn solenoid, 24 cm long, has a diameter of 2.2 cm . A 10-turn coil...

A 450-turn solenoid, 24 cm long, has a diameter of 2.2 cm . A 10-turn coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 2.9 A in 0.57 s , what will be the induced emf in the short coil during this time?

Please explain each step. Thanks!

In: Physics

A skier of mass 75kg starts from rest at the top of a friction less incline...

A skier of mass 75kg starts from rest at the top of a friction less incline that is 20.0 m in height. As soon as she touches the bottom of the incline, she encounters a horizontal surface that is 1000 m long and the skier eventually comes to rest. The coefficient of kinetic friction between skier and snow is 0.205. Find the distance the skier covers before coming to rest. Show all work.

In: Physics

A skier starts from rest at the top of a hill that is inclined at 10.8°...

A skier starts from rest at the top of a hill that is inclined at 10.8° with respect to the horizontal. The hillside is 245 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottom of the hill, the snow is level and the coefficient of friction is unchanged. How far does the skier glide along the horizontal portion of the snow before coming to rest?

In: Physics

10-Two events occur at the same place in a frame S and are separated by a...

10-Two events occur at the same place in a frame S and are separated by a time interval of 1s. The same events are separated by a time interval of 4 s in frame S'. What is the spatial separation of the events in frame S'?

In: Physics

Calculate the electric field(magnitude and direction) at the center of a square 52.5 cm on a...

Calculate the electric field(magnitude and direction) at the center of a square 52.5 cm on a side if one corner is occupied by a - 38.8 μC charge and the other three are occupied by - 27.6 μC charges.

answer is not 7.3*10^6 or 7.3*10^-7

In: Physics

True or False, please answer only if you are sure: A) The work done by a...

True or False, please answer only if you are sure:

A) The work done by a constant force acting on an object is independent of the orientation of the force relative to the motion of the object
B) The work done to raise a box onto a platform depends on how fast it is raised. (Neglect friction, assume it starts on the ground at rest, and ends up resting on the platform)
C) The kinetic energy of a moving object is always positive.
D) The kinetic energy of an object is independent of the direction of the motion involved.
E) Work cannot be done in the absence of motion.
F) The work-energy principle is perfectly valid even when there are frictional forces acting

In: Physics

Two objects, O1 and O2, have charges +3.0μC and −5.0μC, respectively, and a third object, O3,...

Two objects, O1 and O2, have charges +3.0μC and −5.0μC, respectively, and a third object, O3, is electrically neutral.

Part A:

What is the electric flux through the surface A1 that encloses all three objects?

Part B:

What is the electric flux through the surface A2 that encloses the third object only?

In: Physics

"The CMB represents the heat left over from the Big Bang. It is the oldest electromagnetic...

"The CMB represents the heat left over from the Big Bang. It is the oldest electromagnetic radiation in the universe."


Why "heat"? Isn't very cold?

What is the connection between the blackbody and the CMB.

I would like to have a simple explanation for the CMB, with your own words. Please. :-)

Thanks

In: Physics

A test charge of +3.00 μC is placed halfway between a charge of +8.00 μC and...

A test charge of +3.00 μC is placed halfway between a charge of +8.00 μC and another of +5.00 μC separated by 10.00 cm. (a) What is the magnitude of the force on the test charge? (b) What is the direction of this force (away from or toward the +8.00 μC charge)?

In: Physics

A plane with a speed of 800.0 km/hr due east passes directly above a train traveling...

A plane with a speed of 800.0 km/hr due east passes directly above a train traveling due southeast at 100.0 km/hr on a straight level road. The altitude of the aircraft is 10.0 km. How fast is the distance between the plane and the train increasing 45 s after the aircraft passes directly above the train?

In: Physics