Answer:
The thermal energy released per gram is 19.2 kJ/g.
(3) is correct option.
Explanation:
Given that,
Weight of hydrocarbon = 2.50 g
Heat capacity
We need to calculate the thermal energy released
Using formula of thermal energy
Heat released =heat absorb by calorimeter+heat absorb by water
Put the value into the formula
Now, The thermal energy released per gram
Put the value into the formula
Hence, The thermal energy released per gram is 19.2 kJ/g.
In figure A, The balloon is neutral and the cloth is positive (1+). In figure B, The balloon is negative (3-) and the cloth is positive still (4+)
Answer:
la pregunta está incompleta
Answer:
A rover uses 4GHz frequency to transmit a picture. The rover’s transmission power is 200W. Distance = 55*10^9m. The transmission antenna gain is 10,000 and the receiving antenna gain is 100,000. What is the received signal strength at the Earth’s station, in W (assume Pi = 3.14)?
= 31.5 db
Explanation:
Path loss = 20㏒₁₀(4πdf / c)
= 20㏒₁₀(d) + 20㏒₁₀(f) - 20㏒₁₀(4π / c)
= 20㏒₁₀(55 × 10⁹) + 20㏒₁₀(4000) - 147.5
= (20 × 77.4) + 20 × 3.6 - 147.5
= 154 + 72 - 147.5
= 78.5 DB
Received signal strength(power)
Pr = Pt + Gt + Gr - Lp dBW
= 20 + 40 + 50 - 78.5
= 31.5 db
The force (expressed in N), the egg experience upon hitting the ground is 3.5N.
<h3>What is Net force?</h3>
When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
Given is an 0.07 kg egg and toss if from a window 30 m above the ground. The egg reaches and maintains a falling speed of 0.5 m/sec. Upon reaching the ground, the egg rapidly decelerates to 0 m/sec over the course of only 0.01 seconds.
<h3>Average force = Mass x acceleration</h3>
F = m x (Vf -Vi)/t
F = 0.07 x (0 - 0.5)/0.01
F = -3.5N
Thus, the magnitude of force on egg upon hitting the ground is 3.5N.
Learn more about net force.
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