When an object is falling in air at terminal velocity, (choose all correct answers) Group of...
When an object is falling in air at terminal velocity, (choose all correct answers) Group of answer choices the net force on the object is down.
the net force on the object is zero.
the net force on the object is up.
there is no gravitational force on the object.
there is a gravitational force on the object up.
there is a gravitational force on the object down.
the velocity is decreasing.
the velocity is increasing.
the velocity is constant.
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When an object is falling in air at terminal velocity, (choose
all correct answers) Group of...
Question 21 1 pts The direction of the buoyancy force on a rock that sits on...
Question 21 1 pts The direction of the buoyancy force on a rock that sits on the bottom of a lake is down. up. zero. There is no buoyancy force when the rock is on the bottom. impossible to determine. Question 22 3 pts When an object is falling in air at terminal velocity, (choose all correct answers) the net force on the object is down. the net force on the object is zero. the net force on the object...
If a dense 20.0-kg object is falling in air at half its terminal velocity (drag force...
If a dense 20.0-kg object is falling in air at half its terminal velocity (drag force is proportional to the square of the object’s speed), what is the drag force on the object at this moment? a. 25 N b. 50 N c. 75 N d. 100 N e. 150 N
A skydiver jumps out of an airplane at a high altitude and reaches terminal speed. Which...
A skydiver jumps out of an airplane at a high altitude and reaches terminal speed. Which of the following statements about the falling skydiver at terminal speed is FALSE? The air resistance force does negative work on the skydiver. The gravitational force on the skydiver must be larger than the air resistance force in order to maintain a downward velocity. At terminal speed, the kinetic energy of the skydiver is constant. The thermal energy of the skydiver-Earth-atmosphere system is increasing....
For 7-9: A skydiver falls ot constant, terminal velocity in the presence of air resistance 7....
For 7-9: A skydiver falls ot constant, terminal velocity in the presence of air resistance 7. (3 pts) The net work done on the skydiver is.. a) positive b) negative c) zero 8. (3 pts) The non-conservative work done on the skydiver is.. a) positive b) negative c) zero 9. (3 pts) The mechanical energy of the skydiver is. a) conserved c) decreasing b) increasing For each problem, show all work for full credit. Use at least three significant figures...
When an object falls in Earth's gravitational field (think of a skydiver jumping from an airplane or a marble falling in a tank of oil)
When an object falls in Earth's gravitational field (think of a skydiver jumping from an airplane or a marble falling in a tank of oil), it accelerates due to the force of gravity. If gravity were the only force acting on the object, then all objects-elephants and feathers alike would fall at the same rate. But gravity is not the only force present. Moving objects also experience resistance or friction from the surrounding medium; it would be air resistance for...
A students lab group has already agreed on the following two ideas: 1) When an object...
A students lab group has already agreed on the following two ideas: 1) When an object is at terminal velocity, the kinetic energy is constant. 2. The decrease in gravitational energy over a given distance is proportional to the number of filters. Which of the additional ideas below would most be helpful in deciding how the increase in thermal energy depends on the number of coffee filters? a) When an object is at terminal velocity, the increase in thermal energy...
Calculate the terminal velocity for a pollen grain falling through the air using the drag force...
Calculate the terminal velocity for a pollen grain falling through the air using the drag force equation. Assume the pollen grain has a diameter of 7 µm and a density of 0.3 g/cm3. If this grain is released from the top of a tree (height 11 m), estimate the time it will take to fall to the ground. Hint: The pollen grain will reach its terminal velocity very quickly and will have this velocity for essentially the entire motion. Your...
An object is moving in the X-Y plane. At time t_1 the direction of its velocity,...
An object is moving in the X-Y plane. At time t_1 the direction of its velocity, v and acceleration, a are: Direction of v is in the negative X direction Direction of a is in the positive Y direction At time t_1, the magnitude of the velocity of the object is _____. Select increasing, decreasing or constant. A. increasing B. decreasing C. constant At time t, the direction of the velocity of the object is _____. Select changing or not...
If an object is in equilibrium, which of these is definitely true? Group of answer choices...
If an object is in equilibrium, which of these is definitely true? Group of answer choices There is no net force on the object. Its velocity is zero. Its acceleration is positive. None of the answers given is true.
(Newton's 2nd law) Suppose a falling object of mass m is acted on by two forces:...
(Newton's 2nd law) Suppose a falling object of mass m is acted on by two forces: gravity, which acts down with magnitude mg, and a resistive force which acts up with magnitude 2v, where v is the velocity of the object. Does the object approach a terminal velocity? If so, find it.
Question 21 1 pts The direction of the buoyancy force on a rock that sits on the bottom of a lake is down. up. zero. There is no buoyancy force when the rock is on the bottom. impossible to determine. Question 22 3 pts When an object is falling in air at terminal velocity, (choose all correct answers) the net force on the object is down. the net force on the object is zero. the net force on the object...
For 7-9: A skydiver falls ot constant, terminal velocity in the presence of air resistance 7. (3 pts) The net work done on the skydiver is.. a) positive b) negative c) zero 8. (3 pts) The non-conservative work done on the skydiver is.. a) positive b) negative c) zero 9. (3 pts) The mechanical energy of the skydiver is. a) conserved c) decreasing b) increasing For each problem, show all work for full credit. Use at least three significant figures...
When an object falls in Earth's gravitational field (think of a skydiver jumping from an airplane or a marble falling in a tank of oil), it accelerates due to the force of gravity. If gravity were the only force acting on the object, then all objects-elephants and feathers alike would fall at the same rate. But gravity is not the only force present. Moving objects also experience resistance or friction from the surrounding medium; it would be air resistance for...
An object is moving in the X-Y plane. At time t_1 the direction of its velocity, v and acceleration, a are: Direction of v is in the negative X direction Direction of a is in the positive Y direction At time t_1, the magnitude of the velocity of the object is _____. Select increasing, decreasing or constant. A. increasing B. decreasing C. constant At time t, the direction of the velocity of the object is _____. Select changing or not...
(Newton's 2nd law) Suppose a falling object of mass m is acted on by two forces: gravity, which acts down with magnitude mg, and a resistive force which acts up with magnitude 2v, where v is the velocity of the object. Does the object approach a terminal velocity? If so, find it.
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