If a satellite moves above the earths atmosphere in a circular orbit with constant speed, then: A) its acceleration and velocity are in the same direction B) the net force on it is zero C) its velocity is constant D) it will fall back to earth when its fuel is used up E) its acceleration is toward the earth

Q23

Which of these equations would you use to calculate the very least speed with which you could swing a bucket of water of mass m in a vertical circle of radius r and still keep the water in the bucket? A) v = √(rg) B) v = √(rg tan θ) C) v = √(mrg) D) v = mgh E) v = mg/r

The Sun is the most massive object in the Solar System. Each planet experiences a strong gravitational attraction to the Sun, which tends to keep them in stable elliptical orbits. However, a planet sometimes deviates slightly and temporarily from its elliptical path in what is called a perturbation. Which fundamental force or combination of forces causes these perturbations? >strong and weak nuclear forces within the core of the planet >the gravitational force between the planet and a dwarf planet >the electromagnetic force between the planet and solar wind particles >gravitational and electromagnetic forces within the planet-moon system

A neutron star has a mass of 2.0 × 1030 kg (about the mass of our sun) and a radius of 5.0 x 103 m (about the height of a good-sized mountain). Suppose an object falls from rest near the surface of such a star. How fast would this object be moving after it had fallen a distance of 0.015 m? (Assume that the gravitational force is constant over the distance of the fall and that the star is not rotating.) V = J.

Question 3 and 4 are multiple choice

F, 3) A ball of mass 0.500 kg is attached to the end of a cord 1.5 m long. The ball moves in a horizontal circle. If the cord can withstand a maximum tension of 50 N, what is the maximum speed at which the ball can move before the cord breaks?

A neutron star has a mass of 2.0 × 1030 kg (about the mass of our sun) and a radius of 5.0 × 10³ m (about the height of a good-sized mountain). Suppose an object falls from rest near the surface of such a star. How fast would this object be moving after it had fallen a distance of 0.011 m? (Assume that the gravitational force is constant over the distance of the fall and that the star is not rotating.) V = i î

A certain satellite travels in an approximately circular orbit of radius 7.0 x 106 m with a period of 7 h 44 min. Calculate the mass of its planet from this information. Number Units Use correct number of significant digits; the tolerance is +/-2%

A snowboarder is coasting up a hill. The hill is not on Earth. (a) Choose values for the following. None of them can be 0. The value of gravitational acceleration on this planet (on Earth it would be 9.81m/s2) The mass of the snowboarder  iii. The inclination of the hill The coefficient of kinetic friction between the snowboard and the hill The initial velocity of the snowboarder at the base of the hill The distance the skater has to travel from the base of the hill to the peak (b) Draw a picture. (c) Draw the Free Body Diagram. (d) Label the origin and axes. (e) Calculate the weight, normal force and friction force the skater experiences (f) Determine the acceleration of the skater up the hill (g) Does the skater reach the peak of the hill?