Choose the BEST answer to the following: When a tin can is whirled in a horizontal circle, the net force on the can acts (a) inward. (b) outward. (c) upward. (d) None of these.

Q: Is it possible for a body to have inertia but no weight?

A:

Q: Calculate the force a 75 kg high jumper must exert in order to produce an acceleration that is 3.2…

A: The expression for find force is F=mg+a

Q: Is it true that when you drop from a branch to the ground below, you pull upward on Earth? If so,…

A: From Newton's law of gravitation: The gravitational force acting between two massive objects is…

Q: What two forces act on you while you are in a moving elevator? When are these forces of equal…

A: When an object is moving in the elevator, it experiences both gravitational force and normal force.…

Q: A student wrote: “The only reason an apple falls downward to meet the earth instead of the earth…

A: Apple and earth

Q: In order to slide a heavy cabinet across the floor at constant speed,you exert a horizontal force of…

A: In the given case the force of friction between the cabinet and the floor is equal to 600 N.

Q: How does a helicopter get its lifting force?

A: The helicopter gets the lifting force by pushing the air downwards and it gets the thrust from the…

Q: In order to slide a heavy cabinet across the floor at constant speed, you exert a horizontal force…

A: Since the body is moving with constant velocity there is no net force acting on the body. Since the…

Q: What results when the net force on an object increases?

A:

Q: What is a measure of the pull of gravity on an object called?

A: Earth exerts an attractive force on all object and pulling it towards the surface of Earth. The…

Q: When flying a paper airplane, what is causing the thrust?

A: Thrust is another name given to a force responsible for the motion of airplanes and rockets. In…

Q: Consider a vertically launched projectile when air drag is negligible. When is the acceleration due…

A: When a projectile is launched vertically, it is only acted upon by gravity since air drag is…

Q: Which would require a greater force - accelerating a 2 kg mass at 5 m/s² or a 4 kg mass at 2 m/s??

A:

Q: the force exerted by gravity on 70 kg = N. O 10 О 68 О 66

A: According to Newton's Second Law:   Force Exerted By Gravity is :    F = mg          ......(1)…

Q: How does the gravitational force on a falling body compare with the air resistance it encounters…

A: Terminal velocity is an example of balanced force balance the gravitational forces and the air…

Q: Fill in the blanks with the terms “greater than”, “less than”, or “equal to” to outline how the…

A:

Q: accelerates from rest to a speed of 15 m/s in 5.0 seconds? A man weighs 900 newtons standing on a…

A:

Q: When whirling a ball on a string in a circular path, if the string were to break the ball would fly…

A: Given data: The ball is moving in a circular path.

Q: he force of 10 N is making an angle of 30 ° with the horizontal. Its horizontal component will be 4…

A: Given: The magnitude of the force is 10 N.             The angle made by the force with the…

Q: Calculate the average force that must be exerted on a 0.145 kg baseball in order to give it an…

A: The force on an object is its mass m times its acceleration a.

Q: ”If you are in an elevator that is accelerating downwards, the normal force Fn that the bottom of…

A: The free body diagram for the elevator moving downwards is given below.

Q: Calculate the force needed to accelerate a train whose mass is 1000metric tons from rest to a…

A:

Q: Understand the relationship between force, mass and acceleration.

A: The force 'F' is related to the mass 'm' and acceleration 'a '  as  F=ma

Q: Consider you have a beach ball and a bowling ball they are the same size but have different masses.…

A: Given One ball is beach ball Second ball is bowling ball the same size of both balls are same The…

Q: You are in an elevator that is traveling upward, but slowing down at a rate of 2 m/s?. If your mass…

A:

Q: Why can we neglect forces such as those holding a body together when we apply Newton’s second law?

A:

Q: In the absence of a net force, an object can be

A: When the net force on an object is zero, it does not mean that there is no external acting on the…

Q: A student has a mass of 25 kg. If he stands on a scale in an elevator that is accelerating downward…

A: mass of student (m) = 25 kg Acceleration (a) = 2 ms2

Q: Any interaction between objects, which when unopposed will result to a change in motion Mass O…

A: We are asked to name the physical quantity that causes change in motion

Q: What is the weight of a 69-kg astronaut in outer space traveling with constant velocity? Express…

A: The mass of the astronaut, m=69 kg   The acceleration due to gravity on Mars, g=3.7 m/s2

Q: What is the net force

A: Force is a vector quantity therefore while calculating net force on an object the individual forces…

Q: Supposing you were in space in a weightless environment, would it require a force to set an object…

A:

Q: What is the net force experienced by a 2N object sitting on a table with a 5 N object on top of…

A: Consider the free-body diagram for the given objects as follows.

Q: How does a helicopter gets its lifting force?

A: the helicopter gets the lift by pushing the air downwards and it gets the thrust from the reaction…

Q: A tennis ball is dropped straight down from the top of a building. Assuming there is no air…

A: The force of gravity exerted on the tennis ball from the top of a building is, Fg=mg

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.