All categories

2 years ago

Activity

1 answer:

6 0

Answer:Eating. Your muscles in your arms and mouth use energy to feed itself. Then your body digest the food which also takes energy.

Sleep. When your tired, you don’t have much energy. It is said that you use more energy while your sleeping. But how do you become energized if you were using even more energy than before?

You might be interested in

John rode 3,150 m at an average speed of 350 m/min. If he

Vikentia [17]

Answer:

mabye 8

Explanation:

6 0

2 years ago

Which of the following is a common property of Noble Gases?

Softa [21]

<span>Have a full outer shell of electrons.</span>

4 0

3 years ago

Read 2 more answers

A specimen of some metal having a rectangular cross section 9.54 mm x 13.9 mm is pulled in tension with a force of 20100 n, whic

Irina18 [472]

<span>Young modulus E = stress/strain where E is the elastic modulus. We seek to calculate the the strain. But we would have to get the stress first. Tensile stress = Force/Area. Force = 20100N. And the Area = 9.54* 13.9 = 132.606Nm^2. Strain = stress/E.where E = 79. Hence we have 132.606/79 = 1.67</span>

6 0

3 years ago

At 7:00 pm the police discovered a body in a hotel room which maintained a constant temperature of 24 degree C. At the time of d

schepotkina [342]

Explanation:

According to Newton's law of cooling,

$T(t)=T_s+(T_o-T_s){e^{{-t/\tau}}$

T(t) is the temperature at time t

$T_s$ is temperature of surrounding

$k=\dfrac{1}{\tau}$

At the time of discovery, the temperature of the dead body was, $T_o=36^{\circ}C$

Temperature of the surrounding, $T_s=24^{\circ}C$

Temperature after 4 hours, $T=30^{\circ}C$

So, $30=24+(36-24)e^{-4t}$

On solving the above equation,

k = 0.1735

Now, put the value of k in equation (1) at T = 36 degrees C

We know that, the temperature of body before death is T(t) = 37 degrees C

$37=24+(36-24)e^{0.17t}$

On solving above equation,

t = -0.46 hour

As time can't be negative and we have taken 7:00 pm as reference time.

So, t = 27.67 minutes

So, the death of the person is at 6 : 32 pm. Hence, this is the required solution.

3 0

3 years ago

A 4 g bullet is fired horizontally with a speed of 300m/s into 0.8 kg block of wood at rest on a table. If the coefficient of fr

astra-53 [7]

Momentum:
p₁ = m₁v₁
p₂ = m₂v₂

p₃ = (m₁+ m₂) v

p₁ + p₂ = p₃

v = p₁ + p₂ / (m₁ + m₂)

friction:
F = μ(m₁ + m₂)g = (m₁ + m₂)a ⇒ a = μg

equations of motion:
v = at = μgt ⇒ t = v/μg
x = 1/2 at² = 1/2 μg * v²/(μg)² = 1/2 v² / μg

v₁ = 300 m/s
v₂ = 0 m/s
m₁ = 0.004 kg
m₂ = 0.8 kg
μ = 0.3
g = 9.81 m/s²

x = displacement

4 0

3 years ago

Read 2 more answers