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What is the true mass of a man in a plane that is accelerating towards the ground with an acceleration of 0.8.He is standing on a set of scales that read 51kg?
Wiki User
∙ 15y ago
If he is standing on balance scales, then his mass is 51 kg. If he is standing on a spring scale, his actual mass would be closer to 63.75 kg. This also assumes the plane is not accelerating faster than free fall, but slower than it.
Wiki User
∙ 15y ago
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Give an example in which velocity is zero yet acceleration is not zero?
Velocity is directional, so if something is accelerating in the opposite direction from the one it is moving it, there will come a point where it has 0 velocity but still has accelerating. If you throw a ball at the ground and it bounces, for example.
Is it possible for an object to be accelerating even after it has stopped moving?
Yes, a object can still be accelerating when the speed is zero, a classic example of which is throwing a ball straight up in the air, at the top of its trajectory it has an instantaneous velocity of zero while it is still accelerating towards the ground.
When A ball is thrown straight up from the ground. What way does its acceleration point at the top?
Its acceleration points straight down at all times after it's released.
How will a ball falling fom train appear to a passenger on train and a man standing on ground?
To a passenger on the train it will follow a parabolic trajectory facing towards the back of the train. To a man standing on the ground it will be a forward facing parabolic trajectory.
What is the formula used to find distance?
The distance travelled by an object in a given time is given by:Distance = Speed * TimeAlternatively for an object that is accelerating:Distance = (Speed of object before acceleration is applied * Time) + (0.5 * Acceleration * Time squared)If the object is accelerating from speed zero, the first set of brackets is irrelevant.Also, if the object is falling to the ground, acceleration = 9.81
A ball tossed vertically upward rises reaches its highest point and then falls back to its starting point during this time the acceleration is always?
Pointed towards the ground
If you throw an object towards the ground would it acceleration be greater or less thatn an object free falling?
Both objects would eventually reach terminal velocity which means they would both fall at the same speed.- But - compared to the falling object, the downward acceleration of a thrown object is the same.
When is acceleration neg?
Acceleration is negative if velocity is decreasing with time. Since velocity is a vector this can occur in one of two ways: 1) you are slowing down in the direction of motion and the velocity in that direction is defined as positive (this is what we usually mean by negative acceleration) 2) you are speeding up in the direction of motion and the velocity in that direction is defined as negative. An example of this is an object launched into the air which immediately starts to decelerate in it's upward velocity, reaches it's highest velocity, and then begins accelerating towards the ground. If we call the velocity upward a positive velocity, then when it starts falling, it has negative velocity. Note that acceleration (due to gravity) is negative the whole time.
Newton's Third Law says that for every action there is an equal and opposite?
The answer is reaction. A simple example is you standing on the ground. You are not moving or accelerating (in our reference frame). You are pushing down against the ground with a force (the action) equal to your weight. The ground pushes back up (opposite direction) with an equal force (the reaction force).
How fast do objects accelerate when falling to the ground?
When falling to the ground (or even just in the air), the acceleration of an object depends on the gravitational pull of the object it is falling towards. Here on earth, all things fall relative to the earth which causes an acceleration of 9.81 m/s^2
What is the acceleration due to gravity when a body reaches the ground?
The acceleration is still 9.8 m/s2 but the force applied by gravity is counteracted by the ground.
How is acceleration described as the projectile rises and then falls back to the ground?
acceleration remains the same
