ASTR 250 EXAM 1 QUESTIONS AND ANSWERS 2025-2026 #13
1. (formula) relationship b/n: linear ve- v = ωr
locity, angular velocity
2. (formula) relationship b/n: ω = (2π) / P
angular frequency, period
3. (formula) relationship b/n c = λν
frequen- cy, wavelength, and
speed
4. (formula) energy of a photon E = hc/λ
5. (formula) force needed to keep F = mv^2/r
an object in orbit
6. (formula) Newton's Law: force F = GMm/r^2
of gravity
7. (formula) kinetic energy K = ½GMm/r
8. (formula) potential energy U = -GMm/r
9. relationship b/n kinetic and K = −½U
poten- tial energy
10. the kinetic energy of a half, gravitational potential
satellite in a circular orbit is
its
gravitation- al energy and is
positive instead of negative.
when U and K are com- bined,
their total is half the
energy.
1/
11
, ASTR 250 EXAM 1 QUESTIONS AND ANSWERS 2025-2026 #13
11. in astronomy, the sizes of objects in tan θ = d/D
the sky are often given in terms
of their angular diameter as seen
from
2/
11
1. (formula) relationship b/n: linear ve- v = ωr
locity, angular velocity
2. (formula) relationship b/n: ω = (2π) / P
angular frequency, period
3. (formula) relationship b/n c = λν
frequen- cy, wavelength, and
speed
4. (formula) energy of a photon E = hc/λ
5. (formula) force needed to keep F = mv^2/r
an object in orbit
6. (formula) Newton's Law: force F = GMm/r^2
of gravity
7. (formula) kinetic energy K = ½GMm/r
8. (formula) potential energy U = -GMm/r
9. relationship b/n kinetic and K = −½U
poten- tial energy
10. the kinetic energy of a half, gravitational potential
satellite in a circular orbit is
its
gravitation- al energy and is
positive instead of negative.
when U and K are com- bined,
their total is half the
energy.
1/
11
, ASTR 250 EXAM 1 QUESTIONS AND ANSWERS 2025-2026 #13
11. in astronomy, the sizes of objects in tan θ = d/D
the sky are often given in terms
of their angular diameter as seen
from
2/
11
