Weightlessness - class-XI
Description: weightlessness | |
Number of Questions: 54 | |
Created by: Niharika Sharma | |
Tags: newton's laws of motion gravitation: planets and satellites physics mechanics gravitation |
A 50.0 kg boy is sitting on an amusement park ride where he accelerates straight upward from rest to a speed 30.0 m/s in 3.0 s. What is his mass as he accelerates upward?
A plumb bob is hung from the ceiling of a train compartment. the train moves on an inclined track of inclination $30^\circ $ with horizntal. The acceleration of train up the plane is $a=\,g/2$. The angle which the string supporting the bob makes with normal to the ceiling in equilibrium is-
A man of mass 'm' stands on a weighing machine in a lift
List - I | List-II |
---|---|
(a) Lift moves up with uniform acceleration a | (d) mg |
(b) Lift moves down with uniform acceleration a | (e) m(g$+$a) |
(c) Lift moves down with uniform velocity | (f) m(g-a) |
III. The train is increasing its speed.
IV. The train is decreasing its speed.
When a car accelerates rapidly forward, the heads of people in the car seem to jerk backward.
This is best explained by which of the following?
A bird weight 2 kg and is inside a cage of 1kg. If it starts flying then the weight of the bird and cage assembly is
A bird is sitting in a wire cage hanging from the spring balance. Let the reading of the spring balance be $a$. If the bird flies about inside the cage, the reading of the spring balance is $b$. Which of the following is true?
If the position of two like parallel forces shifted by one-fourth of the distance between the forces when the two forces are interchanged. The ratio of the two forces is:
A particle is observed from two frames $S _{1}$ and $S _{2}$. The frame $S _{2}$ moves with respect to $S _{1}$ with an acceleration $a$. Let $F _{1}$ and $F _{2}$ be the pseudo forces on the particle when seen from $S _{1}$ and $S _{2}$ respectively. Which of the following are not possible?
A cyclist riding with a speed of $27kmph$. As he approaches a circular turn on the road of radius $80m$, he applies brakes and reduces his speed at the constant rate of $0.50m/s$ every second. The net acceleration of the cyclist on the circular turn is
The backside of a truck is open and a box of 40kg is placed 5m away from the rear end.The coefficient of friction of the box with the surface of the truck is 0.15.The truck starts from rest with $2m/s^2$ acceleration.Calculate the distance covered by the truck when the box falls off
A jet water issues from a nozzel with a velocity of $20 m/s$ and it impinges normally on a flat plate moving away from it at $10 m/s$. If the cross-sectional area of the jet is $0.02 m^2$ and the density of water is taken as $1000 kg/m^3$, then the force developed on the plate will be
A man drops an apple in the lift. He finds that the apple remains stationary and does not fall. The lift is:
When a lift is going up with uniform acceleration, the apparent weight of a person is $W _{1}$
When the lift is stationary, his apparent weight is $W _{2}$
When the lift falls freely his apparent weight is $W _{3}$
When the lift is going down with uniform acceleration which is less than the acceleration due to gravity, his apparent weight is $W _{4}$
The increasing order of these four weights is
Two identical trains A and B move with equal speeds on parallel tracks along the equator. A moves from east to west and B moves from west to east. Which train exerts greater force on the track?
A lift of mass $1000 \ Kg$ which is moving with acceleration of $1 m/s^{-2}$ in upward direction, then the tension developed in string which is connected to lift is : -
WEIGHTLESSNESS
An astronaut experiences weightlessness in a space satellite. It is because
A spaceship is launched into a circular orbit close to earth's surface. The additional velocity that should be imparted to the spaceship in the orbit to overcome the gravitational pull is:
(Radius of earth $=6400km$ and $g=9.8m\quad { s }^{ -1 }$)
Astronauts on the orbiting space station are weightless because...
In which of the following situations, you will not experience weightlessness?
An astronaut,inside an earth`s satellite experiences weightlessness because
Statement -1 :- A person feels weightlessness in an artificial satellite of the Earth. However a person on the Moon (natural satellite) feels his weight.
and
Statement - 2 :- Artificial satellite is a freely falling body and on the Moon surface, the weight is mainly due to Moon's gravitational attraction.
While orbiting around the earth in a apaceship, an astronaut experiences
Motion of artificial satellite around the earth is powered by :
Which of the following is the cause of weightlessness experienced while orbiting around earth on a spaceship ?
While orbiting around the earth in a spaceship, an astronaut weight becomes
Weightlessness in a satellite is experienced because
A satellite is orbiting the earth at 17,500 MPH, a rock is released from the satellite. Identify what would happen to the rock.
A man weighs $75 kg$ on the surface of the earth. His weight in a geostationary satellite is:
A pendulum beats seconds on the earth. Its time period on a stationary satellite of the earth will be
Time period of simple pendulum in a satellite is
The percentage increase in earth's angular velocity so that all bodies lying on the equator feel weightlessness is nearly:
For satellite in elliptical orbit which of the following quantities does not constant
If an astronaut comes out of the artificial satellite, then
A person sitting in a chair in a satellite feels weightless because
To overcome the effect weightlessness in an artificial satellite
The time period of a second's pendulum inside a satellite will be
In an earth satellite moving in a circular orbit, a piece of metal weighing $16g$ (on the earth) is weighed by a spring balance while the metal is suspended in water. If the relative density of the metal is $8$, what weight will be recorded?
The radius and mean density of the earth are $R$ & $p$ respectively . the critical orbital speed of a satellite for a low altitude orbit is
An astronaut, inside an earth satellite, experiences weightlessness because
Weightlessness experienced while orbiting the earth in a spaceship is the result of
The period of a simple pendulum inside a satellite orbiting earth is
A body suspended from a spring balance is placed in a satellite. Reading in balance is $W _1$ when the satellite moves in an orbit of radius $R$. Reading in balance is $W _2$ when the satellite moves in an or bit of radius $2R.$ Then.
Moon is a satellite of the Earth, but weightlessness is not experienced at the surface of the Moon because
Weightlessness experienced in a spaceship is due to
Read the assertion and reason carefully to mark the correct option out of the options given below :
Reason : As observed by another astronauts in the same satellite, force of gravity and centrifugal force balance each other.
A body is suspended from a spring balance kept in a satellite The reading of the balance is $\displaystyle W _{1}$ when the satellite goes in an orbit of radius $R$ and is $\displaystyle W _{2}$ when it goes in an orbit of radius $2R$ Then
A 60kg man goes around the earth in a satellite. In the satellite, his weight will be
Consider a satellite going round the earth in a circular orbit. Which of the following statements is wrong?
The International Space Station is currently under construction. Eventually, simulated earth gravity may become a reality on the space station. What would the gravitational field through the central axis be like under these conditions?
The rotation of the Earth having radius R about its axis speed upto a value such that a man at latitude angle $60^o$ feels weightless. The duration of the day in such case will be.
The rotation of the Earth having radius $R$ about its axis speeds upto a value such that a man at latitude angle $60^o$ feels weightless. The duration of the day in such case will be.
An astronaut feels weightlessness inside an artificial satellite, because.
STATEMENT-1
An astronaut in an orbiting space station above the Earth experiences weightlessness.
and
STATEMENT-2
An object moving around the Earth under the influence of Earths gravitational force is in a state of free-fall.