1. A 15-kg rock falls from a cliff at a height of 140 m to a cliff that is 36 m above the ground. How fast is the rock falling when it strikes the lower cliff? (45 m/s)
2. A 2.00-kg block of ice is sliding across a frozen pond at 3.00 m/s. A 12-N force is applied in the direction of motion. After the ice block slides 17.0 m, the force is removed. The work done by the applied force is 3. A 5.0-kg ball on the end of a string is whirled at a constant speed of 1.0 m/s in a horizontal circle of radius 5 m. What is the work done by the centripetal force during one revolution? 4. A woman stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 15 m/s. The instant before the stone hits the ground below, it has 2000 J of kinetic energy. If she were to throw the stone horizontally outward from the cliff with the same initial speed of 15 m/s, how much kinetic energy would it have just before it hits the ground? 5. Mike is cutting the grass using a human-powered lawn mower. He pushes the mower with a force of 100 N directed at an angle of 20° below the horizontal direction. Calculate the work that Mike does on the mower in pushing it 5 m across the yard. 6. The kinetic energy of a car is 7000 J as it travels along a horizontal road. How much work is required to stop the car in 20 s? 7. A 1500-kg car travels at a constant speed of 30 m/s around a circular track that is 100 m across. What is the kinetic energy of the car? 8. Use the work-energy theorem to find the force required to accelerate an electron (m =9.11 × 10−31 kg) from rest to a speed of 1.50 × 109 m/s in a distance of 1.25 m. 9. A 1000-kg elevator moves upward with constant speed through a vertical distance of 50m. How much work was done by the tension in the cable? 10. A 15-kg block is lifted vertically 10 meters from the surface of the earth. To one significant figure, what is the change in the gravitational potential energy of the block? 11. An engineer is asked to design a playground slide such that the speed a child reaches at the bottom does not exceed 4.0 m/s. Determine the maximum height that the slide can be. 12. A warehouse worker uses a forklift to lift a crate of pickles on a platform to a height 5 m above the floor. The combined mass of the platform and the crate is 100 kg. If the power expended by the forklift is 2000 W, how long does it take to lift the crate? Answers: 1) (45 m/s) 2) 204 J, 3) 0 J, 4) 2000 J, 5) 470 J, 6) -7000 J, 7) 6.75x105 J, 8) 8.20x10-13 N, 9) 4.9x105 J, 10) 1000 J, 11) 0.816 m, 12) 2.45 s
46 Comments
kknn
21/3/2013 05:59:42 am
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Anonymous
10/2/2014 02:22:34 pm
Why acting like an ass?
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sonakshi
3/12/2014 01:48:51 am
pagal ho kya
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anonymous2
8/3/2015 07:26:18 am
are you frickin out of you mind ^
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Kriti lamba
3/2/2012 11:49:26 am
Its cool..
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apj
3/6/2013 07:06:24 am
not so
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gyan
10/1/2014 03:36:25 am
not cool but u dont know how so solve problems so u r telling lie
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chitra
20/2/2012 08:50:49 am
question no 10. -> the write answer is 1500 J not 1000 J (g= is taken 10)
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apj
27/2/2014 06:25:20 am
its right and not write. now go and learn spellings from class1
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PRERIT
29/2/2012 05:08:06 am
GOOD SITE>.........
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7/8/2012 01:26:09 am
Excellent! I admire all the helpful data you've shared in your articles. I'm looking forward for more helpful articles from you. :)
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Nitesh
16/9/2012 08:17:32 am
now answer my question regarding mathamatics
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Rachael
21/11/2013 08:07:29 am
its a trinomial :D
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shikha
27/10/2014 02:18:49 pm
trinomial
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ADITYS
30/11/2017 06:47:47 pm
pagal ho khy
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Titas
20/10/2012 02:42:49 pm
awesome nice...it really helped me a lot...satisfied...
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ALPH RAJ
10/11/2012 10:07:53 am
VERY EASY NUMERICALS
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arena
30/11/2012 07:08:59 am
niccccccccc.....................
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robin
12/1/2013 09:03:36 am
niceeeeeeeeeeeeeeeeee
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anshika
30/1/2013 11:15:19 am
where actully this coaching is
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Abdul kalam
3/6/2013 07:08:54 am
IN YOUR HEAD anshika
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urja
21/3/2013 06:01:23 am
pls give solution of 1 and 11 question.plssss. tmorow is my exam
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I like these very much
19/4/2013 12:11:21 am
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khyzer
23/4/2013 03:26:50 pm
my answer for Q-10 is 1500j
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puja
5/12/2013 10:44:25 am
thk he thk hai , support k liye
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wedrr
13/1/2019 08:21:06 am
can i fuck you
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ravish gujjar
15/12/2013 10:52:56 am
you r very loser boy yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
Reply
Sieara
15/2/2014 01:32:12 am
where do we get solved solutions to these answers
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rashi rao
18/11/2014 01:50:29 pm
the right answer of Q10 is 1500J
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Rajneesh
10/1/2015 02:31:27 am
Great numericals it would be better if they would be solved
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thanu
4/2/2015 12:59:09 pm
A good website... espcially for the day b4 test... ; )
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ashish
22/8/2015 11:24:34 am
wonder ful
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rokstar
30/9/2015 04:29:27 am
superb site i really likei t.
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CHOSDON
23/12/2015 01:59:58 pm
I LIKE THIS WHICH GIVE ME THE ALL SOLUTION
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riteya sharma
27/12/2015 05:20:44 pm
could u pls specify the method of doing the numericals also cuz m not able 2 figure it out
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Vaishnav
7/1/2016 07:40:03 pm
It'z veeery eaaasy 😫😫😫.You cant get easy sums like this.Why u all guys wnt solutions??? 😱😱😨
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sana
4/3/2016 08:10:49 pm
shut up omg if youre so smart go away
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lkj
22/10/2016 08:05:10 pm
55
Reply
9/12/2017 08:53:50 pm
abe jab tak g nahi diya jata tab hamesha g=9.8 aur uske hisab se gravitational potential energy 1470J hai
Reply
SUYESH MISHRA
17/11/2018 06:43:17 am
When I need to at that time I found that 'The sums are not solved.Just only direct answers are given.'
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