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A room is at a constant temperature of 300 K. A hotplate in the room is at a temperature of 400 K and loses energy by radiation at a rate of P. What is the rate of loss of energy from the hotplate when its temperature is 500 K?

How is angular momentum related to torque?

How do you increase the mechanical advantage of a thirdclass lever?

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And here is one more last question please I need some help. It is about electric potential energy and how it is similar to gravitational potential energy. Thanks!?!

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A tennis ball is thrown from a height #h# above the ground. If the coefficient of restitution #e#, what height will the ball achieve after the third collision ??

The minimum distance from the origin to the intersection of #x^2+y^2= z# with the plane #x+y+z=12# ?

The region R is bounded by the curves y=x² (x»0) , y=9x² (x»0) and the line y=1. Find the volume of the solid obtained when the region R is rotated about the yaxis?

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How can we derive Kirchoff's current law and Kirchoff's voltage law?

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Gauss' Law?

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When is the angle of contact between a liquid and solid interface equal to 90 degrees?

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Could I measure the moment of inertia of a fidget spinner by making it the bob of a pendulum? How?

Why is the surface area of 1000 water drops greater than one whole water drop?

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What are some common mistakes students make with electric potential?

How do I solve this gas problem?

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What is the significance of negative sign of electronic energy?

Particle moving under influence of a constant force is given by V =√42X where X is magnitude of displacement of the particle At t=0 initially the particle is noticed to be moving towards east.The distance travelled by the particle in first 5seconds is?

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Objects A and B are at the origin. If object A moves to #(7 ,5 )# and object B moves to #(5 ,2 )# over #2 s#, what is the relative velocity of object B from the perspective of object A? Assume that all units are denominated in meters.

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How do you derive #eta=(2r^2g(rho_srho_l))/(9v)# for a sphere obeying stokes law in a liquid, falling at terming velocity so that #F+U=W#?

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Can you take a bicycle ride in such a way that the distance you cover is less than the magnitude of your displacement? Explain.

Can someone explain me how this 1.8F came? I know that change in temperature in Celsius scale is equal to change in temperature in Kelvin scale. But, what about Fahrenheit scale?

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Why does the workenergy theory ignores potential energy?

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How do i prove this?

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Two bodies of masses #m_1 and m_2# are connected by a light string which passes over a frictionless massless pulley. If the pulley is moving upward with uniform acceleration #g/2#, what is the tension in the string?

How to solve this?

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The rate of rotation of a solid disk with a radius of #2 m# and mass of #5 kg# constantly changes from #12 Hz# to #16 Hz#. If the change in rotational frequency occurs over #3 s#, what torque was applied to the disk?

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A #9 L# container holds #8 # mol and #2 # mol of gasses A and B, respectively. Every two molecules of gas B bind to one molecule of gas A and the reaction raises the temperature from #370^oK# to #425 ^oK#. How much does the pressure change by?

A stationary uranium nucleus (238U) decay with emission of alpha particle and total kinetic energy.
238/92U ↣234/90Th+ 4/2a
what is Kinetic energy of patricle?

An object with a mass of #6 kg# is pushed along a linear path with a kinetic friction coefficient of #u_k(x)= 1+5cotx #. How much work would it take to move the object over #x in [(7pi)/12, (5pi)/8], where x is in meters?

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A 200 mL glass containing 198 mL of water at 30°C. The expansion coefficient of volume is 4,4 x #10^(4)#°C. If the glass and water are heated, the water will expand and spill at what temperature?

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Charge in a conducting spherical shell ?

Four balls A, B, C and D are projected with the same speed making angles of 20 deg, 30 deg, 45 deg and 80 deg with the horizontal. Which ball will strike the ground at nearest point?

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An object with a mass of #8 kg# is moving at #7 m/s# over a surface with a kinetic friction coefficient of #6 #. How much power will it take to accelerate the object at #8 m/s^2?

Electromagnets are often used at recycling centres to separate some types of metals from other materials. Why is an electromagnet used rather than a permanent magnet?

Rain is falling at the rate of 5.0 cm/h and accumulates in a pan. If the raindrops hit at 8.0 m/s, what is the force on the bottom of a #1.0 m^2# pan due to the impacting rain which does not rebound? Water has a mass of #1.00 X 10^3# kg per #m^3#?

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The sound level at the side of a busy road to be 91 dB when eight trucks are passing at the same time. If the trucks are each contributing about the same level of sound, what would the sound level be if only one truck passed at one time?

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A paddle boat can move at a speed of 2 km/h in still water. The boat is paddled 6 km downstream in a river in the same time it takes to go 3 km upstream. What is the speed of the river?

A question on circular motion?

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Centripetal force calculation question?

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If two waves, each of amplitude #z#, produce a resultant wave of amplitude #z#, then what is the phase difference between them? Is there a specific equation or formula I can use?

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