What are the perihelion and aphelion speeds of Mercury?
What are the perihelion and aphelion distances...
What are the perihelion and aphelion speeds of Mercury?
What are the perihelion and aphelion distances of this planet?
Compute the product vr
(speed times distance) at each of these two points and interpret
your result physically.
A radar unit is used to measure speeds of cars on a motorway.
The speeds are normally distributed with LaTeX: \mu=90 μ = 90 km/hr
and a standard deviation of LaTeX: \sigma=9.2 σ = 9.2 km/hr.
Approximately 86.21% of the population has a speed of at least 100
km/hr. True or false?
The maximum distance from the Earth to the Sun (at aphelion) is
1.521 1011 m, and the distance of closest approach (at perihelion)
is 1.471 1011 m. The Earth's orbital speed at perihelion is 3.027
104 m/s. Ignore the effect of the Moon and other planets. (a)
Determine the Earth's orbital speed at aphelion. m/s (b) Determine
the kinetic and potential energies of the Earth
What is methyl mercury? II. Sources of Methyl Mercury? III.
Health concerns and potential receptors? IV. Susceptibility ? V.
Remediation? VI. Long term effects? VII. Existing studies and
guidelines? VIII. Risk? IX. Is the trade off worth it? We need
energy.?
At the perihelion of its orbit a planet is 4.45x1012
m from a star. The maximum distance between the planet and the star
is 7.35x1012 m. The mass of the star is
2.99x1030 kg. What is the period of the planet? (1 year
= 3.156x107 seconds)
The sample data below are the typing speeds (in words per
minute) and reading speeds (in words per minute) of nine randomly
selected secretaries. Here, x denotes typing speed, and y denotes
reading speed.
X
60
56
52
63
70
58
44
79
62
Y
587
551
528
607
645
531
503
652
571
At the 10% significance level, predict the reading speed for a
typing speed of 74 words per
minute.
Because of the toxicity of mercury compounds, mercury(I)
chloride is used in antibacterial salves. The mercury(I) ion (Hg2
2+ ) consists of two bound Hg+ ions.
a. What is the chemical formula of mercury(I) chloride? (1
mark)
b. Calculate [Hg2 2+ ] in a saturated solution of mercury(I)
chloride (Ksp = 1.5 x 10-18 ).
c. Seawater contains 0.03 kg of NaCl per litre. Using a suitable
approximation, find [Hg2 2+ ] if the seawater is saturated with
mercury(I) chloride....
A comet moves in an elliptical orbit around the sun. As the
comet moves from aphelion (the point on the orbit farthest from the
sun) to perihelion (the point on the orbit closest to the sun),
which of the following results is true?
Speed of the comet
Angular momentum of the comet/sun system
Gravitational potential energy of the comet/sun
system
A
Increases
Increases
Decreases
B
Increases
Constant
Decreases
C
Decreases
Decreases
Increases
D
Increases
Increases
Constant
E
Constant
Constant
Constant