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Answered 1 day ago CBSE/Class 11/Science/Physics/Unit 3-Laws of Motion/Chapter 5-Laws of Motion

Explain why (a) a horse cannot pull a cart and run in empty space, (b) passengers are thrown forward... read more

Explain why
(a) a horse cannot pull a cart and run in empty space,
(b) passengers are thrown forward from their seats when a speeding bus stops suddenly,
(c) it is easier to pull a lawn mower than to push it,
(d) a cricketer moves his hands backwards while holding a catch.

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Om Prakash Mishra

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(a) Because there is no force of reaction. (b) due to inertia of motion. (c)when pulling a component of applied force balances the weight. But in pushing weight increases (d) by pulling hand back time of impact increases and receives less injury.
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Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 6-Gravitation/Chapter 8-Gravitation

Io, one of the satellites of Jupiter, has an orbital period of 1.769 days and the radius of the orbit... read more

Io, one of the satellites of Jupiter, has an orbital period of 1.769 days and the radius of the orbit is 4.22 x 108 m. Show that the mass of Jupiter is about one-thousandth that of the Sun.

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Asked 3 hrs ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 9-Mechanical Properties of Solids

The edge of an aluminium cube is 10 cm long. One face of the cube is firmly fixed to a vertical wall.... read more

The edge of an aluminium cube is 10 cm long. One face of the cube is firmly fixed to a vertical wall. A mass of 100 kg is then attached to the opposite face of the cube. The shear modulus of aluminium is 25 GPa. What is the vertical deflection of this face?

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Asked 3 hrs ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 9-Mechanical Properties of Solids

Four identical hollow cylindrical columns of mild steel support a big structure of mass 50,000 kg. The... read more

Four identical hollow cylindrical columns of mild steel support a big structure of mass 50,000 kg. The inner and outer radii of each column are 30 cm and 60 cm respectively. Assuming the load distribution to be uniform, calculate the compressional strain of each column. Young’s modulus, Y = 2.0 x 1011 Pa.

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Asked 3 hrs ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 9-Mechanical Properties of Solids

A piece of copper having a rectangular cross-section of 15.2 mm x 19.1 mm is pulled in tension with 44,500... read more

A piece of copper having a rectangular cross-section of 15.2 mm x 19.1 mm is pulled in tension with 44,500 N force, producing only elastic deformation. Calculate the resulting strain? Shear modulus of elasticity of copper is 42 x 109 N/m2.

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Asked 3 hrs ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 9-Mechanical Properties of Solids

A steel cable with a radius of 1.5 cm supports a chairlift at a ski area. If the maximum stress is not... read more

A steel cable with a radius of 1.5 cm supports a chairlift at a ski area. If the maximum stress is not to exceed 108 Nm-2 what is the maximum load the cable can support ?

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Asked 3 hrs ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 9-Mechanical Properties of Solids

A rod of length 1.05 m having negligible mass is supported at its ends by two wires of steel (wire A... read more

A rod of length 1.05 m having negligible mass is supported at its ends by two wires of steel (wire A ) and aluminium (wire B) of equal lengths as shown in figure.
cbse-class-11-physics-ncert-solutions-chapter-9-mechanical-properties-solids-21
The cross-sectional areas of wires A and B are 1.0 mmand 2.0 mm2, respectively. At what point along the rod should a mass m be suspended in order to produce (a) equal stresses and (b) equal strains in both steel and aluminium wires.

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Asked 3 hrs ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 9-Mechanical Properties of Solids

A mild steel wire of length 1.0 m and cross-sectional area 0.50 x 10-2 cm2 is stretched, well within... read more

A mild steel wire of length 1.0 m and cross-sectional area 0.50 x 10-2 cm2 is stretched, well within its elastic limit, horizontally between two pillars. A mass of 100g is suspended from the mid-point of the wire. Calculate the depression at the mid-point.

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Asked 3 hrs ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 9-Mechanical Properties of Solids

The Marina trench is located in the Pacific Ocean, and at one place it is nearly eleven km beneath the... read more

The Marina trench is located in the Pacific Ocean, and at one place it is nearly eleven km beneath the surface of water. The water pressure at the bottom of the trench is about 1.1 x 108 Pa. A steel ball of initial volume 0.32 m3 is dropped into the ocean and falls to the bottom of the trench. What is the change in the volume of the ball when it reaches to the bottom?

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