Gravitation

Q. What is the gravitational potential energy of a mass of 10 kg at a height of 5 m above the ground? (2000)
  • A. 500 J
  • B. 1000 J
  • C. 1500 J
  • D. 2000 J
Q. What is the gravitational potential energy of a mass of 10 kg at a height of 5 m in a gravitational field of strength 9.8 N/kg?
  • A. 490 J
  • B. 50 J
  • C. 98 J
  • D. 0 J
Q. What is the gravitational potential energy of a mass of 10 kg at a height of 5 m above the ground? (g = 9.8 m/s²)
  • A. 490 J
  • B. 98 J
  • C. 588 J
  • D. 0 J
Q. What is the gravitational potential energy of a mass of 2 kg at a height of 10 m? (g = 9.8 m/s²)
  • A. 19.6 J
  • B. 39.2 J
  • C. 78.4 J
  • D. 98 J
Q. What is the gravitational potential energy of a mass of 2 kg at a height of 10 m above the ground? (g = 9.8 m/s^2)
  • A. 196 J
  • B. 98 J
  • C. 20 J
  • D. 10 J
Q. What is the gravitational potential energy of a mass of 2 kg at a height of 10 m in a gravitational field of 9.8 m/s²?
  • A. 19.6 J
  • B. 39.2 J
  • C. 78.4 J
  • D. 98 J
Q. What is the gravitational potential energy of a satellite of mass m at a height h above the Earth's surface?
  • A. -GMm/R
  • B. -GMm/(R+h)
  • C. -GMm/(R-h)
  • D. -GMm/(R^2 + h^2)
Q. What is the gravitational potential energy of an object of mass m at a height h above the Earth's surface?
  • A. mgh
  • B. gh/m
  • C. mg/h
  • D. mgh^2
Q. What is the gravitational potential energy of two masses m1 and m2 separated by a distance r?
  • A. -G * (m1 * m2) / r
  • B. G * (m1 * m2) / r
  • C. G * (m1 + m2) / r
  • D. -G * (m1 + m2) / r
Q. What is the gravitational potential energy U of two masses m1 and m2 separated by a distance r?
  • A. U = -G * (m1 * m2) / r
  • B. U = G * (m1 * m2) / r
  • C. U = (m1 + m2) * r
  • D. U = G * (m1 - m2) / r
Q. What is the minimum speed required for a satellite to achieve a low Earth orbit?
  • A. 7.9 km/s
  • B. 11.2 km/s
  • C. 5.0 km/s
  • D. 9.8 km/s
Q. What is the minimum speed required for a satellite to maintain a low Earth orbit?
  • A. 7.9 km/s
  • B. 11.2 km/s
  • C. 5.0 km/s
  • D. 9.8 km/s
Q. What is the orbital speed of a satellite in a circular orbit at a height h above the Earth's surface?
  • A. sqrt(GM/R^2)
  • B. sqrt(GM/(R+h)^2)
  • C. sqrt(GM/(R-h)^2)
  • D. sqrt(GM/R)
Q. What is the orbital speed of a satellite in a low Earth orbit (LEO) approximately 2000 km above the Earth's surface? (2000)
  • A. 7.9 km/s
  • B. 11.2 km/s
  • C. 5.0 km/s
  • D. 3.0 km/s
Q. What is the period of a satellite in a circular orbit at a height of 300 km above the Earth's surface?
  • A. 90 minutes
  • B. 60 minutes
  • C. 120 minutes
  • D. 30 minutes
Q. What is the period of a satellite in a low Earth orbit (LEO) compared to a satellite in a geostationary orbit?
  • A. Longer than a geostationary orbit
  • B. Shorter than a geostationary orbit
  • C. Equal to a geostationary orbit
  • D. Depends on the mass of the satellite
Q. What is the primary force acting on a satellite in a stable orbit around the Earth?
  • A. Gravitational force
  • B. Electromagnetic force
  • C. Frictional force
  • D. Centrifugal force
Q. What is the relationship between gravitational field strength and gravitational potential?
  • A. Field strength is the gradient of potential.
  • B. Field strength is the integral of potential.
  • C. They are independent.
  • D. Field strength is the square of potential.
Q. What is the relationship between gravitational potential and gravitational field strength?
  • A. V = -g * r
  • B. g = -dV/dr
  • C. V = g * r
  • D. g = dV/dr
Q. What is the relationship between the height of a satellite and its orbital period?
  • A. Directly proportional
  • B. Inversely proportional
  • C. No relationship
  • D. Exponential relationship
Q. What is the relationship between the orbital radius and the period of a satellite in a circular orbit?
  • A. T is directly proportional to r
  • B. T is inversely proportional to r
  • C. T is proportional to r^2
  • D. T is proportional to √r
Q. What is the relationship between the orbital radius and the time period of a satellite?
  • A. T ∝ r^2
  • B. T ∝ r^3/2
  • C. T ∝ r
  • D. T ∝ r^1/2
Q. What is the relationship between the period of a satellite and its orbital radius?
  • A. T is directly proportional to r
  • B. T is inversely proportional to r
  • C. T is proportional to r^2
  • D. T is proportional to √r
Q. What is the shape of the equipotential surfaces around a point mass?
  • A. Straight lines
  • B. Parabolas
  • C. Spheres
  • D. Cylinders
Q. What is the shape of the gravitational field lines around a point mass?
  • A. Straight lines
  • B. Curved lines
  • C. Concentric circles
  • D. Radial lines
Q. What is the unit of gravitational potential?
  • A. J/kg
  • B. N/kg
  • C. J
  • D. kg
Q. What is the value of gravitational acceleration (g) at the surface of the Earth?
  • A. 9.8 m/s²
  • B. 10 m/s²
  • C. 9.81 m/s²
  • D. 8.9 m/s²
Q. What is the value of gravitational acceleration at the height equal to the radius of the Earth?
  • A. g/2
  • B. g/4
  • C. g/3
  • D. g/8
Q. What is the value of gravitational acceleration at the surface of the Earth?
  • A. 9.8 m/s^2
  • B. 10 m/s^2
  • C. 9.81 m/s^2
  • D. 8.9 m/s^2
Q. What is the value of the gravitational constant G?
  • A. 6.67 x 10^-11 N(m/kg)^2
  • B. 9.81 m/s^2
  • C. 3.00 x 10^8 m/s
  • D. 1.60 x 10^-19 C
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