Math, asked by lydiamargaretjones11, 4 months ago

4. A cinder block is sitting on a platform 20 m high. It weighs 79 N. The block has... energy.
Calculate it.
energy
5. There is a bell at the top of a tower that is 45 m high. The bell weighs 190 N. The bell has...
energy. Calculate it.
6. A roller coaster is at the top of a 72 m hill and weighs 966 N. The coaster (at this moment) has...
energy. Calculate it.
7. What is the kinetic energy of a 3-kilogram ball that is rolling at
meters per second?
8. Two objects were lifted by a machine. One object had a mass of 2 kilograms, and was lifted at a speed of
2 m/sec. The other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec.
a. Which object had more kinetic energy while it was being lifted?
b. Which object had more potential energy when it was lifted to a distance of 10 meters? Show your
calculation.
Same type of answers for the previous question of mine.​

Answers

Answered by KhizerSultan
1

Step-by-step explanation:

4. block has ..P.E (potential energy)..

height (h) = 20 m

weighy (W) = 79 N

P.E = mgh

W = mg

P.E = Wh

P.E = (79)*(20)

P.E = 1580 J

5. bell has ..P.E...

h = 45 m

W = 190 N

P.E = Wh

P.E = 190*45

P.E = 8550 J

6.roller coaster(at that moment) has ..P.E...

h = 72 m

W = 966 N

P.E = Wh

P.E = 966*72

P.E = 69552 J

7. mass (m) = 3 kg

velocity (v) = 1 m/s

K.E = 1/2 mv²

K.E = 1/2 (3)(1)²

K.E = 1/2(3)

K.E = 3/2 J

or K.E = 1.5 J

8. Object A;

m = 2 kg

v = 2 m/s

Object B

m = 4 kg

v = 3 m/s

a) K.E = ?

object A; K.E = 1/2mv²

K.E = 1/2(2)(2)²

K.E = 1/2(2)(4)

K.E = 1/2(8)

K.E = 4 J

object B; K.E = 1/2mv²

K.E = 1/2(4)(3)²

K.E = 1/2(3)(9)

K.E = 1/2(27)

K.E = 13.5 J

Hence, in object B kinetic energy is more

b) P.E = ?

h = 10m

object A; P.E = mgh

P.E = (2)(9.8)(10)

P.E = 196 J

object B; P.E = mgh

P.E = (4)(9.8)(10)

P.E = 392 J

Hence P.E of object B is more

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