Homework Answers
Gravitational potential energy acts on an object because of its position and is one of the conservative force that is depends only on the initial and final position of object.
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An object of mass 40 lb is at an elevation of 160 ft relative to the...
An anchor with a density of 700 lb/ft tied to a rope is submerged in water...
An anchor with a density of 700 lb/ft tied to a rope is submerged in water (but is not touching the bottom). It has a volume of 3.o ft3. What is the buoyancy force on that object? 1. (700 lb/ft3)(3 ft3) 2. (700 lb/ft3)(32.2 ft/s2)(3 ft 3. (62.4 lb/ft3(3 ft3 4. (62.4 lb/ft3)(32.2 ft/s2(3 ft What is the weight of the anchor? 1. (700 lb/ft(3 ft3) 2. (700 lb/ft)(32.2 ft/s2)(3 3. (62.4 lb/ft)(3 ftS) 4. (62.4 lb/ft)(32.2 ft/s )(3 What...
A hiker of mass 66 kg is going to climb to the top of Mount Tam, which has an elevation of 2,574 ft.
A hiker of mass 66 kg is going to climb to the top of Mount Tam, which has an elevation of 2,574 ft.If the hiker starts climbing at an elevation of 490 ft, what will their change in gravitational potential energy be, in joules, once they reach the top? Assume the zero of gravitational potential energy is at sea level.ΔVg =?
If an undamped spring-mass system with a mass that weighs 6 lb and a spring constant...
If an undamped spring-mass system with a mass that weighs 6 lb and a spring constant 1 lb/in is suddenly set in motion at t = 0 by an external force of 3 cos 7t lb, determine the position of the mass at any time. (Use g = 32 ft/s2 for the acceleration due to gravity. Let u(t), measured positive downward, denote the displacement in feet of the mass from its equilibrium position at time t seconds.) u(t) = ft
(1 point) A mass weighing 8 lb stretches a spring 3 in. Suppose the mass is...
(1 point) A mass weighing 8 lb stretches a spring 3 in. Suppose the mass is displaced an additional 11 in in the positive (downward) direction and then released with an initial upward velocity of 2 ft/s. The mass is in a medium, that exerts a viscuouse resistance of 1 lb when the mass has a velocity of 4 ft/s. Assume g 32 ft/s is the gravitational acceleration (a) Find the mass m (in lb.s/ft) (b) Find the damping coefficient...
Derive an expression for the energy needed to launch an object from the surface of Earth...
Derive an expression for the energy needed to launch an object from the surface of Earth to a height h above the surface. Ignoring Earth's rotation, how much energy is needed to get the same object into orbit at height h? Express your answer in terms of some or all of the variables h, mass of the object m, mass of Earth mE, its radius RE, and gravitational constant G.
Derive an expression for the energy needed to launch an object from the surface of Earth...
Derive an expression for the energy needed to launch an object from the surface of Earth to a height h above the surface. Ignoring Earth's rotation, how much energy is needed to get the same object into orbit at height h? Express your answer in terms of some or all of the variables h, mass of the object m, mass of Earth mE, its radius RE, and gravitational constant G.
A mass weighing 4 pounds is attached to a spring whose constant is 2 lb/ft
A mass weighing 4 pounds is attached to a spring whose constant is 2 lb/ft. The medium offers a damping force that is numerically equal to the instantaneous velocity. The mass is initially released from a point 1 foot above the equilibrium position with a downward velocity of 16 ft/s. (g = 32 ft/s2) a. Find the equation of motion. b. What type of motion is this? c. Determine the time at which the mass passes through the equilibrium position.
A vertical spring has a mass of 500 g attatched to it, the system is at equilibrium. When pulled ...
A vertical spring has a mass of 500 g attatched to it, the system is at equilibrium. When pulled 30 cm down, it takes 12.4 seconds to finish 10 oscillations. The amplitude is approximately 20 cm througout. a. what is the spring constant? when the system is at rest, the mass is 40 cm above a flat surface. Find the potential energy of the spring, the gravitational potential energy of the mass, and the kinetic energy of the mass when:...
A 4,410-pound mass [lbm] ball is released from a height of 19.7 feet [ft] above a...
A 4,410-pound mass [lbm] ball is released from a height of 19.7 feet [ft] above a flat surface on the moon. Gravitational acceleration on the moon is 1.62 meters per second squared [m/s2]. Assume that no energy is lost from frictional drag. How much Power in Watts [W] will it take to lift the object up to the height of 19.7 feet [ft] in 1.2 minutes [min]? What is the power in horsepower? Will a 300 Watt Motor with an...
You have a rocket of mass 2350 kg. How much work does the force of gravity...
You have a rocket of mass 2350 kg. How much work does the force of gravity do on the rocket if it moves from Earth's surface to 3.0 times the Earth's radius away? Be careful to use the definition of work that accounts for a force that changes based on location! J G = 6.67 x 10-11 m3/kg/s2 MEarth = 5.97 x 1024 kg REarth = 6.37 x 106 m What is the change in gravitational potential energy as the...
An anchor with a density of 700 lb/ft tied to a rope is submerged in water (but is not touching the bottom). It has a volume of 3.o ft3. What is the buoyancy force on that object? 1. (700 lb/ft3)(3 ft3) 2. (700 lb/ft3)(32.2 ft/s2)(3 ft 3. (62.4 lb/ft3(3 ft3 4. (62.4 lb/ft3)(32.2 ft/s2(3 ft What is the weight of the anchor? 1. (700 lb/ft(3 ft3) 2. (700 lb/ft)(32.2 ft/s2)(3 3. (62.4 lb/ft)(3 ftS) 4. (62.4 lb/ft)(32.2 ft/s )(3 What...
(1 point) A mass weighing 8 lb stretches a spring 3 in. Suppose the mass is displaced an additional 11 in in the positive (downward) direction and then released with an initial upward velocity of 2 ft/s. The mass is in a medium, that exerts a viscuouse resistance of 1 lb when the mass has a velocity of 4 ft/s. Assume g 32 ft/s is the gravitational acceleration (a) Find the mass m (in lb.s/ft) (b) Find the damping coefficient...
A vertical spring has a mass of 500 g attatched to it, the system is at equilibrium. When pulled 30 cm down, it takes 12.4 seconds to finish 10 oscillations. The amplitude is approximately 20 cm througout. a. what is the spring constant? when the system is at rest, the mass is 40 cm above a flat surface. Find the potential energy of the spring, the gravitational potential energy of the mass, and the kinetic energy of the mass when:...
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