What value is needed to create a motion diagram? a. position c. time interval b. velocity d. both a and c

1 answer:

5 0

For classical kinematics, you usually graph position versus time, meaning D. This would be a graph where time is on the x-axis and position (can also be treated as displacement if you consider the net distance) is on the y axis.

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calculate the work done in kilo joules in lifting a mass of 20kg at steady velocity through a vertical height of 20m

bulgar [2K]

Answer:

$\huge\boxed{\sf Work\ done = 4 kJ}$

Explanation:

Since work done is in the form of potential energy, we will use the formula of potential energy here.

We know that,

Where,

m = mass = 20 kg

g = acceleration due to gravity = 10 m/s²

h = vertical height = 20 m

So,

Work done = (20)(10)(20)

Work done = 4000 joules

Work done = 4 kJ

$\rule[225]{225}{2}$

5 0

2 years ago

The latent heat of vaporization of H₂O at body temperature (37°C) is 2.42 x 10⁶ J/kg. To cool the body of a 60.4-kg jogger [aver

Darya [45]

Answer:

Explanation:

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When the sweat on our body evaporates, it absorbs energy from our body to overcome it's Latent heat of vaporisation. Thus our body cools down when sweat evaporates.

So, Energy absorbed by sweat to evaporate = Energy lost by body

Specific heat capacity of human body = $3500\text{ }\frac{J}{kg\text{ }C^{o}}$ . Jogger weights 60.4 kg. Body temperature decreases by $1.08\text{ }C^{o}$