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nirvana33 [79]
3 years ago
14

Question 1 of 10

Physics
1 answer:
Bad White [126]3 years ago
3 0
The answer is b maybe?
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A Boy can raise a load of 200N up to a<br>height of 2.5m in 15 seconds. calculate his<br>power​
shtirl [24]

Explanation:

f=mg

=200×10

=200N

Now,

work done=df

25×200

=500J

7 0
3 years ago
Two planets have the same surface gravity, but planet b has twice the radius of planet
vampirchik [111]
Planet A;
m = the mass 
Let r =  the radius 

Planet B:
Let M =  the mass
The radius is 2r (twice the radius of planet A)

The surface gravitational acceleration of planets A and B (they have the same surface gravity) are
g= \frac{Gm}{r^{2}} \, and \, g= \frac{GM}{(2r)^{2}} \\\\ m= \frac{M}{4} \\\\ M=4m

Answer: The mass of planet B is 4m.
3 0
3 years ago
Read 2 more answers
An insulated piston–cylinder device contains 100 L of air at 400 kPa and 25°C. A paddle wheel within the cylinder is rotated unt
solong [7]

Answer:

T'=70.92°C

Explanation:

Given that

V= 100 L=0.1 m³

P=400 KPa

T=25°C

Work done on the air = 15 KJ

W= -15 KJ

If we assume that air is ideal gas

P V = m R T

R=0.287 KJ/kg.K for air

T= 273 + 25 = 298 K

By putting the values

P V = m R T

400 x 0.1 = m x 0.287 x 298

m=0.46 kg

From first law of thermodynamics

Q= ΔU +W

Insulated piston–cylinder  , Q=0

ΔU  = m Cv  ΔT

   ΔU = - W

Cv = 0.71 KJ/kg.k for air

0.46 x 0.71 x (T' -25) = 15  

T'=70.92 °C

So the final temperature of air is T'=70.92 °C

7 0
3 years ago
How long would it take a drag racer to increase her speed from 10m/s to 20 m/s if her car accelerates at a uniform rate of 15 m/
weeeeeb [17]

Answer:

t = 0.67 [s]

Explanation:

To solve this problem we must use the following kinematics equation.

v_{f} =v_{i} +(a*t)\\where:

Vf = final velocity = 20[m/s]

Vi = initial velocity = 10 [m/s]

a = aceleration = 15 [m/s^2]

Now replacing in the equation we have:

20 = 10 + (15*t)

t = (20-10)/15

t = 0.67 [s]

7 0
3 years ago
Giant cave systems have formed through the reaction of acids with the BLANK that make up limestone
Ivenika [448]
<h3><u>Answer;</u></h3>

Carbonates

<h3><u>Explanation;</u></h3>
  • Giant cave systems have formed through the reaction of acids with carbonates the that make up limestone.
  • <em><u>Caves are formed as a result of dissolution of limestone, through a type of chemical weathering known as carbonation. This happens when rainwater picks up carbon dioxide from the air and as it percolates through the soil, resulting to the formation of weak carbonic acid. </u></em>
  • The weak carbonic acid formed then slowly dissolves out the limestone along the joints, bedding planes and fractures, some of which become enlarged enough to form caves.
  • Largest caves are formed at a place where the water flows onto the limestone  from an adjacent impermeable Portishead formation and Avon Group mudstones.
3 0
3 years ago
Read 2 more answers
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