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A 150 ohm kettle is connected to a 220 V, 50 Hz ac supply. Calculate the power delivered to the kettle.

In a bicycle competition called Tour De France, two riders; A and B are riding bicycles at constant acceleration of magnitude $1{\text{m/s}}^2$ and $3{\text{m/s}}^2$ respectively, in the North direction. Their initial speeds are $15\text{m/s}$ and $10\text{m/s}$ respectively while they were heading in the North direction. Find the separation between them after $t=10\text{s}$.

For the travelling harmonic wave y (x, t) = 2.0 cos $2\pi (10t-0.0080x+0.35)$ where x and y are in cm and t in s. Calculate the phase difference between oscillatory motion of two points separated by a distance of

(a) 4 m
(b) 0.5 m
(c) $\frac{\lambda }{2}$
(d) $\frac{3\lambda }{4}$

A mass m is suspended from a spring of length l and force constant K. The frequency of vibration of the mass is $f_1$ . The spring is cut into two equal parts and the same mass is suspended from one of the parts. The new frequency of vibration of mass is $f_2$. Which of the following relations between the frequencies is correct?

Human brain weighs about:

Find the angle of incidence of ray for which after reflection, it passes through pole of concave mirror.

A particle of mass m is moving in a circular path of radius r under the influence of centripetal force $F=\frac{-C}{r^2}$. The total energy of the particle is

If the blocks A and B are moving towards each other with acceleration a and b respectively (with ground) as shown in Fig. The net acceleration of block C with respect to ground. Assume all surfaces to be smooth.

The current in a discharging LR circuit is given by $i=i_{0}e-t\tau$ where \tau is the time constant of the circuit. Calculate the rms current for the period t = 0 to $t=\tau$.

A town has a population of 1 million. The average electric power needed per person is 300 W. A reactor is to be designed to supply power to this town. The efficiency with which thermal power is converted into electric power is aimed at 25 %. (a) Assuming 200 MeV of thermal energy to come from each fission event on an average, find the number of events that should take place every day. (b) Assuming the fission to take place largely through ${}^{235}U$, at what rate will the amount of ${}^{235}U$ decrease ? Express your answer in kg per day. (c) Assuming that uranium enriched to 3% in ${}^{235}U$ will be used, how much uranium is needed per month (30 days) ?

Figure (32 - E10) shows a part of an electric circuit. The potentials at teh points a,b and c are 30 V , 12 V and 2 V respectively. Find the currents through the three resistors.

Figure (32 - E10)

An ideal gas is trapped between a mercury column and the closed-end of a narrow vertical tube of uniform base containing the column. The upper end of the tube is open to the atmosphere. The atmospheric pressure equals 76 cm of mercury. The lengths of the mercury column and the trapped air column are 20 cm and 43 cm respectively. What will be the length of the air column when the tube is tilted slowly in a vertical plane through an angle of ${60}^0$ ? Assume the temperature to remain constant.

Find the surface energy of water kept in a cylindrical vessel of radius 6.0 cm. Surface tension of water =$0.075J{m}^{-2}$.

A U-tube in which the cross-sectional area of the limb on the left is one quarter, the limb on the right contains mercury (density 13.6 g/ $c{m}^3$). The level of mercury in the narrow limb is at a distance of 36 cm from the upper end of the tube. What will be the rise in the level of mercury in the right limb if the left limb is filled to the top with water

Find the reading of the spring balance for the figure shown. Take $g=10m/s^2$

A shell at rest on a smooth horizontal surface explodes into two fragments of masses $m_1$ and $m_2$. If just after explosion $m_1$ move with speed $u$, then work done by internal forces during explosion is

A plane mirror is approaching you at a speed of you can see your image in it. At what speed will your image approach you

If the road of the previous problem is horizontal (no banking), what should be the minimum friction coefficient so that a scooter going at 18 km/hr does not skid ?

A gas has a density of $3\text{g/L}$ at S.T.P. What is its molar mass?

A body of mass $1\text{kg}$ is thrown upwards with a velocity $10\text{m/s}$. It momentarily comes to rest after attaining a height of $4\text{m}$. How much energy is lost due to air friction? ($g=10{\text{m/s}}^2$)

In the circuit given in the figure, switch S is closed at position 1 for long time. Find the total heat generated in resistor of resistance $2r_0$, when the switch S is open at position 1 and closed at position 2.

The ratio of the radii of gyration of a circular disc about a tangential axis in the plane of the disc and of a circular ring of the same radius about a tangential axis in the plane of the ring is

I wnt to know when potential at apoint gets added or subtracted becoz if the presence of other charges..

Clear me please

In some ques potential gets added n in other there is difference...

Two blocks each having a mass of 3.2 kg are connected by awire CD and the system is suspended from the ceiling by another wire AB (figure 15-E5). The linear mass density of the wire AB is $10g{m}^{-1}$ and that of CD is $8g{m}^{-1}.$ Find the speed of a transverse wave pulse produced in AB and in CD.

The classroom door is of width $50\text{cm}$. The force of $5\text{N}$ is applied on the handle which is situated in the middle of the smaller plate as shown below. Compute the torque about the hinge (lever arm) of the door.

A box is pushed through 4 m across a floor of weight 10 N resistance.How much work is done by the

1) applied force

2)resistive force

Which of the following cannot be the resultant of 5 and 10?

1. 5
2. 8
3. 2
4. 7

A particle executes simple harmonic motion with an amplitude of 4 cm. At the

mean position the velocity of the particle is 10 cm/s. The distance of the

particle from the mean position when its speed becomes 5 cm/s is

[EAMCET (Med.) 2000]

A square coil $AECD$ of side $0.1\text{m}$ is placed in a magnetic field $B=2t^2$. Here, $t$ is in seconds and $B$ is in Tesla. The magnetic field is into the paper. At time $t=2\text{s}$, induced electric field in $DC$ is

A body starts from rest and travels $s\text{m}$ in $2^{nd}$ second, then, acceleration is

In a non uniform external field the dipole has a net force in the direction of increasing field when

Water is flowing in streamline motion through a tube with its axis horizontal. Consider two points A and B in the tube at the same horizontal level.

Read the following information carefully and answer the questions mentioned below.

1. Five friends Amar, Kapil, Sarvesh, Rohan and Nagesh put on five shirts of different colours i.e., Red, Yellow, Blue, White and Green, while they were going to attend a party. These colours are not in order.

2. They have different hobbies as Reading, Playing, Outing, Singing and Writing.

3. Kapil, who likes singing, does not wear yellow shirt.

4. Sarvesh wears red shirt and he does not like reading or writing.

5. Nagesh likes playing and he does not wear blue or yellow shirt.

6. Amar likes writing and Rohan does not wear yellow or green shirt.

Q52. Who likes reading?

The viscous force on a moving block is directly proportional to velocity. The unit of constant of proportionality is

A parallel plate capacitor of area A, plate separation d and capacitance C is filled with three different dielectric materials having dielectric constants $K_1,K_{2}and{K}_3$ as shown in Fig. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant K is given by

A tuning fork of frequency $340\text{Hz}$ is vibrated just above a cylindrical tube. The length of the tube is $120\text{cm}$. Water is slowly poured into the tube. Determine the minimum height of water required for resonance. (Take velocity of sound in air $\text{v}=340\text{m/s}$)

Derivation of energy stored in a parallel plate capacitor?

If the door of a refrigerator is kept open, then which of the following is true

Which of the following graphs shows the variation of magnitude of velocity of a ball against time during the projectile motion of a ball.

A body of mass m moving with a velocity v in the x-direction collides and sticks with another body of mass M moving with a velocity V in the y-direction. The magnitude of the momentum of the composite body is

Three long, straight and parallel wires C, D and G carrying currents are arranged as shown in Fig. The force experienced by a 25 cm length of wire C is