Physics
General
Easy
Question
In a two dimensional motion of a particle, the particle moves from point , position vector . If the magnitudes of these vectors are respectively, =3 and and the angles they make with the axis are and 15, respectively, then find the magnitude of the displacement vector
 15

 17

The correct answer is: 17
Displacement
angle between and
From figure
cos
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A block(B) is attached to two unstretched springs with springs constants representively (see Fig. I) The other ends are attached to identical supports and not attached to the walls. The springs and supports have negligible mass. There is no friction anywhere. The block is displaced towards wall I by small distance and released. The block returns and moves a maximum distance y towards wall 2.Displacements are measured with respect to the equilibrium position of the block The ratio is
From energy conservation,
A block(B) is attached to two unstretched springs with springs constants representively (see Fig. I) The other ends are attached to identical supports and not attached to the walls. The springs and supports have negligible mass. There is no friction anywhere. The block is displaced towards wall I by small distance and released. The block returns and moves a maximum distance y towards wall 2.Displacements are measured with respect to the equilibrium position of the block The ratio is
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From energy conservation,
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A small roller coaster starts at point A with a speed on a curved track as shown in the figure.
The friction between the roller coaster and the track is negligible and it always remains in contact with the track. The speed of roller coaster at point on the track will be
There is no loss of energy. Therefore, the final velocity is the same as the initial velocity.
Hence, The speed of roller coaster at point D is
Hence, The speed of roller coaster at point D is
A small roller coaster starts at point A with a speed on a curved track as shown in the figure.
The friction between the roller coaster and the track is negligible and it always remains in contact with the track. The speed of roller coaster at point on the track will be
physicsGeneral
There is no loss of energy. Therefore, the final velocity is the same as the initial velocity.
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Physics
A body of mass is moving with a uniform speed along a circle of radius , what is the average acceleration in going from to ?
Here,
Change in velocity is going from to =
Average acceleration
Change in velocity is going from to =
Average acceleration
A body of mass is moving with a uniform speed along a circle of radius , what is the average acceleration in going from to ?
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Here,
Change in velocity is going from to =
Average acceleration
Change in velocity is going from to =
Average acceleration
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A body of mass is moving with a uniform speed of on friction less surface under the influence of two forces and . The net power of the system is
Speed is constant
Work done by forces = 0
Power
Work done by forces = 0
Power
A body of mass is moving with a uniform speed of on friction less surface under the influence of two forces and . The net power of the system is
physicsGeneral
Speed is constant
Work done by forces = 0
Power
Work done by forces = 0
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From an inclined plane two particles are projected with same speed at same angle , one up and other down the plane as shown in figure, which of the following statements is/are correct?
So, . The acceleration of both the particles is downwards. Therefore, relative acceleration between the two I zero or relative motion between the two is uniform. The relative velocity of w.r.t. is towards, therefore collision will take place between the two in mid air.
From an inclined plane two particles are projected with same speed at same angle , one up and other down the plane as shown in figure, which of the following statements is/are correct?
physicsGeneral
So, . The acceleration of both the particles is downwards. Therefore, relative acceleration between the two I zero or relative motion between the two is uniform. The relative velocity of w.r.t. is towards, therefore collision will take place between the two in mid air.
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In this time body acquire kinetic energy
By the law of conservation of energy
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Area between curve and displacement axis
In this time body acquire kinetic energy
By the law of conservation of energy
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By the law of conservation of energy
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Range horizontal initial velocity
In path 4 range is maximum so football possess maximum horizontal velocity in the path
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