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* If a Type III Scholarship recipient falls below the minimum grade point average of 3.30, recipient will be informed that he/she is no longer eligible to receive scholarship assistance.# 9th Class Science Work and energy Power

## Power

Category : 9th Class

### Power

The rate of doing work is called power.

$(P)=\frac{\text{work}\,\text{done}\,\text{(W)}}{\text{time}\,\text{taken}\,\text{(t)}}=\,\,\text{or}\,\,P=\frac{W}{t}$

• Power is expressed in watt (W). When a body performs work at the rate of 1 J per second, its power is 1 W. Power is a scalar quantity.
• Horse power is another unit of power.

1 hp = 746 W

= 0.746 kW

Commercial Unit of Energy

The unit joule is too small and hence is inconvenient to express large quantities of energy. So, we use a bigger unit of energy called kilowatt hour (kW h).

1 kW h = 1 kW $\times$ 1 h

= 1000 W $\times$ 3600 s

= 3600000 J

1 kW = 3.6 $\times$ 106 J

Which one of the following is the commercial unit of energy?

(a) Joules

(b) Watt

(c) KW

(d) KWh

(e) None of these

One kilowatt hour is equal to:

(a) $36\times {{10}^{6\,}}J$

(b) $136\times {{10}^{6}}J$

(c) $3.6\times {{10}^{6}}J$

(d) $1.36\times {{10}^{6}}J$

(e) None of these

One horse power is equal to:

(a) 746 watt

(b) 74.6 watt

(c) 7.46 watt

(d) 746 kw

(e) None of these

Work done by a string when a stone is tied to it and whriled in a circle is:

(a) Positive

(b) Negative

(c) Zero

(d) All of these

(e) None of these

• Work is said to be done if the force applied on the object cause displacement.
• The capacity to do the work is called energy.
• The energy possessed by the object by the virtue of its motion is called kinetic energy.
• The energy possessed by the body by the virtue of its shape and position is called potential energy.
• The commercial unit of power is KWh.

#### Other Topics

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You will be redirected in 3 secThis game has now been moved back to LA due to unplayable field conditions in Mexico City.
As we enter week 11, we add a look at current playoff standings if the season ended today.
Can the New York Giants Pull Off The Nearly Impossible?
Prior to week 10, members of the New York Giants claimed to the media that they could win their final eight games and finish 9-7 and make the playoffs. With a 1-7 record at the time of this statement, the chances of winning eight consecutive games and moving from last place to first place was so infinitesimal that the odds of winning the lottery were not much worse.
Yet, if the Giants were to win just one game in the first half of the schedule and then go undefeated in the second half of the schedule to win the division and make the playoffs, it would have precedent. Yes, this has been done one time before in the post-merger era.
In fact, it was the first year of the merger between the NFL and former AFL. In the AFC Central, the Cleveland Browns and Pittsburgh Steelers had moved from the former NFL Century Division along with Houston and Cincinnati. Entering the season, Cleveland was the heavy favorite to breeze to the division title and the second pick to the Baltimore Colts (Which had moved from the NFL Coastal Division to the AFC East Division, as it was ridiculous for the Colts and Rams to be in the same division). The Browns had advanced to the NFL Championship Game in 1969 and returned the bulk of their roster.
Pittsburgh had been the worst team in the NFL in 1969, going 1-13. Still, the Steelers were expected to contend with a mediocre Houston Oilers team for second place in the division, but nobody expected either team to contend with Cleveland or for the newly created single Wildcard spot for the AFC.
And, then there was Cincinnati. The Bengals had been in existence for just two seasons. They were a dismal 3-11 in 1968, but in 1969, they had one fantastic rookie quarterback. Greg Cook, a local hero who had been a star quarterback at Chillicothe High School and the University of Cincinnati, had been the Bengals’ first round pick in the 1969 draft. Cook immediately won the starting quarterback job in training camp. He was a gunslinger type passer, typical of the type of quarterback that made the AFL more exciting than the conservative NFL. The Bengals, led by legendary coach Paul Brown, rarely threw short passes. Their strategy was to stretch the field vertically to open up running lanes for their two starting running backs, halfback Paul Robinson fullback Jess Phillips.
Cook’s debut was similar to Pat Mahomes this year with the Chiefs. In his very first game, the Bengals beat Miami thanks to two long touchdown passes from Cook to receiver Eric Crabtree. Nobody thought too much of the game, since the Dolphins were also an expansion team that had yet to build up a decent roster. In week two, Cincinnati hosted a San Diego Chargers team that was a contender for the AFL West title. The Chargers were big favorites, and Cook once again hooked up for two long touchdown passes, one to Bob Trumpy and one to future head coach Bruce Coslet.
At 2-0, the Bengals picked up a little notice, but week three was going to obviously be their week for comeuppance. The powerful Kansas City Chiefs with the best defense in AFL history were coming to the Queen City. Cook would have no chance against the best defensive line in all of football, the line that would lead KC to the Super Bowl title in a few months. Because of the great start, NBC made this their nationally televised AFL Game in the early time slot, and yours truly was perched in front of the big Zenith TV watching this game in all hopes that the new phenom could become another Joe Namath and Daryle Lamonica for the much “funner” AFL.
Cook once again opened this game with brilliant passing plays to set up his running backs. After spotting the Chiefs a couple of field goals, Cook led the Bengals on a scoring drive that ended with a scoring pass to Crabtree. The Bengals led 7-6, but their history was about to be changed forever. In the second quarter, Cook dropped back to pass and faced a Chiefs’ blitz by the outside linebackers. Chiefs’ outside linebacker Jim Lynch knocked Cook to the ground, forcing all his weight on Cook’s throwing shoulder. Cook would later say he heard his shoulder pop, and he exited the game with intense pain.
The Bengals hung on to win behind back up QB and future head coach Sam Wyche. They were an incredible 3-0 and led the AFL West over the Chiefs and Raiders. However, their gunslinger was out of bullets for the next three weeks. Had doctors been able to diagnose a torn rotator cuff, they would have held Cook out for the rest of the year, but 1969 was a different time. Cook was expected to come back and play in four weeks, maybe even less if he felt strong enough to throw.
He came back two weeks later, because the Bengals could not move the ball without him in the lineup. They failed at San Diego and fell to 3-1. Cook wasn’t ready to face the second best defense in the league in the New York Jets. He could not get any strength behind his passes, and the Jets’ pass rush forced him to throw quickly in fear of further hurting his shoulder. He didn’t last a half. He had to leave the game in the second quarter, and the Bengals lost to the Jets by 14. It was a mistake for him to try to play, and his shoulder hurt worse than it had after the initial injury.
Cook was held out of play the next two weeks, and the Bengals looked more like the expansion team they were. A weak Denver team pummeled them, and then the Chiefs punished them in a revenge match at Municipal Stadium in Kansas City. The loss dropped the Bengals to 3-4 at the halfway mark. Cincinnati would have to win out to have any chance of making the playoffs, and they had yet to play the powerhouse team of