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A 10 kg block is pushed across a horizontal surface with a speed of 5 m/s. The coefficient of kinetic friction between the block and the surface is 0.3. How much force is needed to maintain this speed?

A

24.5 N

B

29.4 N

C

34.3 N

D

39.2 N

Question Tags

📚 Subject:Physics

📑 Chapter:Laws of Motion

🎯Topic:Laws Of Friction

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :4 mins

🔄Ncert Concepts :kinetic_friction, constant_speed, newton's_laws

The special theory of relativity is based on the frame of reference which has constant?

A

Acceleration

B

Speed

C

Time interval

D

Space interval

Question Tags

📚 Subject:Physics

📑 Chapter:Dual Nature of Matter and Radiation

🎯Topic:Photoelectric Effect (Lenard'S Experiment)

🎓 Ncert Level:Remembering

🎯Difficulty :Medium

⚡ Time Required :1 mins

🔄Ncert Concepts :Special Relativity, Frame of Reference, Constant Speed

The coefficient of kinetic friction between a 20 kg box and the floor is 0.40. How much work does a pulling force do on the box in pulling it 8.0 m across the floor at constant speed? The pulling force is directed $37^\circ$ above the horizontal

A

343 J

B

482 J

C

14.4 J

D

None of these

Question Tags

📚 Subject:Physics

📑 Chapter:Laws of Motion

🎯Topic:Laws Of Friction

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :3 mins

🔄Ncert Concepts :work, kinetic friction, force components, constant speed

A stone of mass m tied to string of length $l$ is rotating along a circular path with constant speed v. The torque on the stone is

A

$mlv$

B

$\frac{{mv}}{l}$

C

$\frac{{m{v^2}}}{l}$

D

Zero

Question Tags

📚 Subject:Physics

📑 Chapter:Systems Of Particles And Rotational Motion

🎯Topic:Rolling Motion

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :torque, circular motion, constant speed, centripetal force

The minimum wavelength of $X$ -rays produced in a coolidge tube operated at potential difference of $40\;kV$ is

A

$0.31\;\mathop A\limits^ \circ$

B

$3.1\;\mathop A\limits^ \circ$

C

$31\;\mathop A\limits^ \circ$

D

$311\;\mathop A\limits^ \circ$

Question Tags

📚 Subject:Physics

📑 Chapter:Atoms

🎯Topic:X-Rays

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :X-rays, Minimum wavelength, Energy of electron, Planck's constant, Speed of light

The energy of a photon of light of wavelength $450\;nm$ is

A

$4.4 imes {10^{ - 19}}J$

B

$2.5 imes {10^{ - 19}}J$

C

$1.25 imes {10^{ - 17}}J$

D

$2.5 imes {10^{ - 17}}J$

Question Tags

📚 Subject:Physics

📑 Chapter:Dual Nature of Matter and Radiation

🎯Topic:Einsteins Photo Electric Equation

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :photon energy, wavelength, Planck's constant, speed of light

Photon of frequency $v$ has a momentum associated with it. If $c$ is the velocity of light, the momentum is

A

hv/c

B

hvc

C

c/hv

D

hv/c²

Question Tags

📚 Subject:Physics

📑 Chapter:Dual Nature of Matter and Radiation

🎯Topic:De-Broglie Hypothesis

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :photon momentum, energy of photon, Planck's constant, speed of light

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