Ekassh
University M

helo

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## 2

#### Why is it much harder to explain the line spectra of polyelectronic atoms and ions than it is to explain the line spectra of hydrogen and hydrogen-like ions?

How are they different?
30/06/2014

## 1

#### "When the speed of a rear-drive car is increasing on a horizontal road the direction of the frictional force on the tires is: "

"A. forward for all tires B. backward for all tires C. forward for the front tires and backward for the rear tires D. backward for the front tires and forward for the rear tires E. zero"
26/02/2013

## 1

#### "A forward force on the axle accelerates a rolling wheel on a horizontal surface. If the wheel does not slide the frictional force of the surface on the wheel is: "

"A. zero B. in the forward direction C. in the backward direction D. in the upward direction E. in the downward direction"
26/02/2013

## 1

#### "Two wheels roll side-by-side without sliding, at the same speed. The radius of wheel 2 is twice the radius of wheel 1. The angular velocity of wheel 2 is: "

"A. twice the angular velocity of wheel 1 B. the same as the angular velocity of wheel 1 C. half the angular velocity of wheel 1 D. more than twice the angular velocity of wheel 1 E. less than ...
26/02/2013

## 1

#### "A disk starts from rest and rotates about afixed axis, subject to a constant net torque. The work done by the torque during the second revolution is as the work done during the first revolution. "

"A. the same B. twice as much C. half as much D. four times as much E. one-fourth as much"
26/02/2013

## 1

#### "A disk starts from rest and rotates around afixed axis, subject to a constant net torque. The work done by the torque during the second 5s is as the work done during thefirst 5s. "

"A. the same B. twice as much C. half as much D. four times as much E. one-fourth as much"
26/02/2013

## 1

#### "A disk has a rotational inertia of 6.0kg· m2 and a constant angular acceleration of 2.0rad/s2 . If it starts from rest the work done during thefirst 5.0s by the net torque acting on it is: "

"A. 0 B. 30J C. 60J D. 300J E. 600J"
26/02/2013

## 1

#### "A circular saw is powered by a motor. When the saw is used to cut wood, the wood exerts a torque of 0.80N· m on the saw blade. If the blade rotates with a constant angular velocity of 20rad/s the work done on the blade by the motor in 1.0min is: "

"A. 0 B. 480J C. 960J D. 1400J E. 1800J"
26/02/2013

## 1

#### "A disk with a rotational inertia of 5.0kg· m2 and a radius of 0.25m rotates on afixed axis perpendicular to the disk and through its center. A force of 2.0N is applied tangentially to the rim. As the disk turns through half a revolution the work done by the force is: "

"A. 1.6J B. 2.5J C. 6.3J D. 10J E. 40J"
26/02/2013

## 1

#### "A pulley with a radius of 3.0cm and a rotational inertia of 4.5×10 −3 kg·m2is suspended from the ceiling. A rope passes over it with a 2.0-kg block attached to one end and a 4.0-kg block attached to the other. The rope does not slip on the pulley. At any instant after the blocks start moving, the object with the greatest kinetic energy is: "

"A. the heavier block B. the lighter block C. the pulley D. either block (the two blocks have the same kinetic energy) E. none (all three objects have the same kinetic energy)"
26/02/2013

## 5

#### Rationalize why chalk (calcium carbonate) has a higher melting point than motor oil (large compound made from carbon and hydrogen), which has a higher melting point than water and engages in relatively strong hydrogen bonding interactions.

Answered: A hydrogen bond will be the electromagnetic attractive interaction between polar molecules, where hydrogen will a highly electronegative atom, for instance nitrogen, oxygen or fluorine
09/07/2014

## 2

#### If conditions are not favourable than how Nostoc would reproduce?

Answered: Nostoc is often a genus of cyanobacteria within a number of environmental niches that forms colonies consisting of filaments of moniliform cells in a gelatinous sheath. The name Nostoc was coined...
14/04/2014

## 3

#### How elementary canal bacteria are useful?

Answered: Bacteria isolated from the digestive tract of the pea aphid, Acyrthosiphon pisum, were identified mainly as varieties of the genera Sarcina, Micrococcus, Achromobacter, and Flavobacterium. Starch...
14/04/2014

## 7

#### Define basic impulse insulation level (BIL) ?

Answered: "The Basic Impulse Insulation Levels refers to the ability of electric equipment such as transformers to withstand lightning surges. When lightning strikes a transmission line, a traveling wave is ...
29/09/2012

## 8

#### Explain the term baud.

Answered: "Contrary to popular belief, baud is not a direct measurement of data transfer speed, but instead it measures how many electrical signals are sent per second. Baud is used to measure the rate of ...
29/09/2012

## 8

#### What is a Bayesian estimation?

Answered: "Suppose an unknown parameter θ is known to have a prior distribution . Let be an estimator of θ (based on some measurements x), and let be a loss function, such as squared error. The Bayes risk ...
29/09/2012

## 8

#### Why is beamforming also termed as spatial filtering?

Answered: "Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception.[1] This is achieved by combining elements in a phased ...
29/09/2012

## 7

#### What is an autotransformer? Where are they most suited?

Answered: "A transformer is a power converter that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils. A varying current in the first or ...
29/09/2012

## 8

#### Define an auxiliary relay with examples.

Answered: " An auxiliary is a person who is employed to assist other people in their work. Auxiliaries are often medical workers or members of the armed forces. "
29/09/2012