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Shalnov [3]
3 years ago
14

Why do scientists ask questions?

Physics
2 answers:
aleksandrvk [35]3 years ago
8 0
To clear their doubts and make/discover new things

andrezito [222]3 years ago
4 0
Scientists ask questions so that they can be answered. As well as solving the world and its mysteries
You might be interested in
A canister is filled with 310 g of ice and 100. G of liquid water, both at 0 ∘c . The canister is placed in an oven until all th
olya-2409 [2.1K]

Here in the process we require

1. Heat to melt down all ice

2. Heat to raise the temperature of whole water to 100 degree C

3. Heat to boil off the water

now here for the first part

Heat required to melt the ice

Q_1 = mL

Q_1 = 310*80  = 24800 cal

now heat required to raise the temperature to 100 degree C

Q_2 = ms\Delta T

Q_2 = (310 + 100)*1*(100 - 0)

Q_2 = 41000 cal

Now heat required to boil it off

Q_3 = mL

Q_3 = 410*540 = 221400 cal

now the total heat required will be

Q = Q_1 + Q_2 + Q_3

Q = 24800 + 41000 + 221400

Q = 287200 cal

so it required 287200 calorie heat to boil it all water

6 0
3 years ago
A river flows with a uniform velocity vr. A person in a motorboat travels 1.22 km upstream, at which time she passes a log float
storchak [24]

Answer:

 t ’= \frac{1450}{0.6499 + 2 v_r},  v_r = 1 m/s       t ’= 547.19 s

Explanation:

This is a relative velocity exercise in a dimesion, since the river and the boat are going in the same direction.

By the time the boat goes up the river

        v_b - v_r = d / t

By the time the boat goes down the river

        v_b + v_r = d '/ t'

let's subtract the equations

       2 v_r = d ’/ t’ - d / t

       d ’/ t’ = 2v_r + d / t

       t' = \frac{d'}{ \frac{d}{t}+ 2 v_r }

In the exercise they tell us

         d = 1.22 +1.45 = 2.67 km= 2.67 10³ m

         d ’= 1.45 km= 1.45 1.³ m

at time t = 69.1 min (60 s / 1min) = 4146 s

the speed of river is v_r

      t ’= \frac{1.45 \ 10^3}{ \frac{ 2670}{4146} \  + 2 \ v_r}

      t ’= \frac{1450}{0.6499 + 2 v_r}

In order to complete the calculation, we must assume a river speed

          v_r = 1 m / s

       

let's calculate

      t ’= \frac{ 1450}{ 0.6499 + 2 \ 1}

      t ’= 547.19 s

8 0
3 years ago
You are pedaling forward on your bike. which of the following would decrease your acceleration?
Minchanka [31]

B. An increase in your mass

Because acceleration is inversely proportional to the mass of the object.

a∝ \frac{1}{m}

7 0
3 years ago
A boy pulls a 28.0-kg box with a 230-N force at 35° above a horizontal surface. If the coefficient of kinetic friction between t
ddd [48]

Answer:

1977.696 J

Explanation:

Given;

Weight of the box = 28.0 kg

Force applied by the boy = 230 N

angle between the horizontal and the force = 35°

Therefore,

the horizontal component of the force = 230 × cosθ

= 230 × cos 35°

= 188.405 N

Coefficient of kinetic friction, μ = 0.24

Force by friction, f = μN

here,

N = Normal force = Mass × acceleration due to gravity

or

N = 28 × 9.81 = 274.68 N

therefore,

f = 0.24 × 274.68

or

f = 65.9232 N

Now,

work done by the boy, W₁ = 188.405 N × Displacement  

= 188.405 N × 30

= 5652.15 J

and,

the

work done by the friction, W₂ = - 65.9232 N × Displacement  

= - 65.9232 N × 30 m

= - 1977.696 J

[ since the friction force acts opposite to the direction of motion, therefore the workdone will be negative]

8 0
3 years ago
Bethany had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed f
kozerog [31]
A chemical reaction produced a gas
7 0
3 years ago
Read 2 more answers
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