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3. a) What is the kinetic energy in a 0.1Mstv planetary nebula, expanding at 10'km? b)...
Consider a planetary nebula with distance 1.5 kpc and angular size 12 arcsec: a. What is...
Consider a planetary nebula with distance 1.5 kpc and angular size 12 arcsec: a. What is its linear radius? b. Suppose this hot *T = 30,000 K) star emits ionizing photons at a rate of 6.92*10^47 s^(-1). Assuming a recombination coefficient α = equals 3*10^(-13) cm^3/s, estimate the density of electrons in the nebula. c. Assuming this is a spherical nebula, calculate the emission measure.
What kind of energy transformation occurs when a rock falls, including air resistance? a. Kinetic energy...
What kind of energy transformation occurs when a rock falls, including air resistance? a. Kinetic energy is converted to gravitational energy and thermal energy: energy is conserved. b. Gravitational potential energy is converted to kinetic energy: energy is not conserved. OC. Gravitational potential energy is converted to kinetic energy and thermal energy: energy is conserved. d. Thermal energy is converted to gravitational energy: energy is not conserved.
Given the formula of the kinetic energy of a particle m with speed v: KE =...
Given the formula of the kinetic energy of a particle m
with
speed v:
KE = 1⁄2mv2 ,
and the formula of the gravitational potential energy:
PE = -GMEm/R,
where G is gravitational constant and ME and R=6378 km are the
mass and the radius of Earth. Now the particle is shot from Earth
surface to space. Find the minimum required initial speed for this
particle to completely escape the influence of Earth gravity (i.e.
PE=0). Notice that the gravitational...
An empty truck traveling at 10 km/h has kinetic energy. How much kinetic energy does it...
An empty truck traveling at 10 km/h has kinetic energy. How much kinetic energy does it have when loaded so that its mass and its speed are both doubled?
1a) What is the kinetic energy (in J) of a 2610-pound automobile traveling at 62.5 km...
1a) What is the kinetic energy (in J) of a 2610-pound automobile traveling at 62.5 km per hour? b) What energy transformations take place when a moving car brakes and skids to a stop? Select all that apply. Total energy is conserved. The kinetic energy of the car is converted into thermal energy. The brakes and tires are cooler after the car stops then just before the brakes were applied. Total energy is not conserved.
(a) the Sun, (b) (a) What is the gravitational potential energy of an interstellar cloud, with...
(a) the Sun, (b) (a) What is the gravitational potential energy of an interstellar cloud, with a density of 1000 H atoms/cm^3 and radius of 10 pc? (b) What is its kinetic energy if its temperature is 10 K?
What energy transformation takes place when the skater rolls uphill with friction? A. kinetic energy to...
What energy transformation takes place when the skater rolls uphill with friction? A. kinetic energy to potential energy and thermal energy B. Potential energy to kinetic energy and thermal energy C. kinetic energy to thermal energy D. Potential energy to kinetic energy E. kinetic energy to potential energy
A 1 033-kg satellite orbits the Earth at a constant altitude of 108-km. (a) How much...
A 1 033-kg satellite orbits the Earth at a constant altitude of 108-km. (a) How much energy must be added to the system to move the satellite into a circular orbit with altitude 194 km? 416.664 MJ (b) What is the change in the system's kinetic energy? 782.5 Is the satellite moving faster or slower when it's orbit is at a higher altitude? MJ (c) What is the change in the system's potential energy? 391.3 x What is the equation...
The figure is a graph of the gravitational potential energy and kinetic energy of a 70...
The figure is a graph of the gravitational potential energy and
kinetic energy of a 70 g yo-yo as it moves up and down on its
string. The acceleration of gravity is 9.81 m/s2 .
a) By what amount does the mechanical energy of the yo-yo change
after 6.0 s? Answer in units of J.
b) What is the speed of the yo-yo after 4.5 s? Answer in units of
m/s.
c) What is the maximum height of the yo-yo?...
(a) What is the kinetic energy in joules of a 960-kg automobile traveling at 76 km/h?...
(a) What is the kinetic energy in joules of a 960-kg automobile traveling at 76 km/h? J (b) How much work would have to be done to bring a 960-kg automobile traveling at 76 km/h to a stop? J
What kind of energy transformation occurs when a rock falls, including air resistance? a. Kinetic energy is converted to gravitational energy and thermal energy: energy is conserved. b. Gravitational potential energy is converted to kinetic energy: energy is not conserved. OC. Gravitational potential energy is converted to kinetic energy and thermal energy: energy is conserved. d. Thermal energy is converted to gravitational energy: energy is not conserved.
Given the formula of the kinetic energy of a particle m
with
speed v:
KE = 1⁄2mv2 ,
and the formula of the gravitational potential energy:
PE = -GMEm/R,
where G is gravitational constant and ME and R=6378 km are the
mass and the radius of Earth. Now the particle is shot from Earth
surface to space. Find the minimum required initial speed for this
particle to completely escape the influence of Earth gravity (i.e.
PE=0). Notice that the gravitational...
(a) the Sun, (b) (a) What is the gravitational potential energy of an interstellar cloud, with a density of 1000 H atoms/cm^3 and radius of 10 pc? (b) What is its kinetic energy if its temperature is 10 K?
A 1 033-kg satellite orbits the Earth at a constant altitude of 108-km. (a) How much energy must be added to the system to move the satellite into a circular orbit with altitude 194 km? 416.664 MJ (b) What is the change in the system's kinetic energy? 782.5 Is the satellite moving faster or slower when it's orbit is at a higher altitude? MJ (c) What is the change in the system's potential energy? 391.3 x What is the equation...
The figure is a graph of the gravitational potential energy and
kinetic energy of a 70 g yo-yo as it moves up and down on its
string. The acceleration of gravity is 9.81 m/s2 .
a) By what amount does the mechanical energy of the yo-yo change
after 6.0 s? Answer in units of J.
b) What is the speed of the yo-yo after 4.5 s? Answer in units of
m/s.
c) What is the maximum height of the yo-yo?...
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Question 501 pts
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