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taurus [48]
3 years ago
9

PLEASE HELP WITH GIVE BRAINLIEST!!! ❤️

Physics
1 answer:
sasho [114]3 years ago
6 0
The force that the book exerts on the table is a normal force, not a weight force. (The book's weight doesn't act on the table, it acts on the book.) It's equal in magnitude to the weight of the book, again, because of the first law.
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What is the speed of a wave in (m/s) with a 5 meter wavelength and a period of 20 seconds?
arlik [135]

Answer: 0.25 m/s

Explanation:  Speed = wavelengt · frequency  

v = λf   and frequency is 1/period  f = 1/T

Then v = λ/T = 5 m / 20 s = 0.25 m/s

6 0
3 years ago
Nitromethane (ch3no2) burns in air to produce significant amounts of heat. 2 ch3no2(l) + 3 2 o2( g) ¡ 2 co2( g) + 3 h2o(l) + n2
ANEK [815]

From the balanced reaction, we are given that 1418 kJ of heat is released for every 2 moles of nitromethane (CH3NO2) reacted.

So first calculate the moles of CH3NO2:

moles CH3NO2 = 5560 g / (61.04 g/mol)

moles CH3NO2 = 91.1 mol

 

So total heat released is:

total heat = (-1418 kJ / 2mol) * 91.1 mol

<span>total heat = -129,162.52 kJ = -129.16 MJ</span>

6 0
3 years ago
Read 2 more answers
An aircraft engine takes in 8950 J of heat and discards 6150 J each cycle. Part A)
Alborosie

Answer:

(a) 2800 J

(b) 31.28 %

Explanation:

Heat intake, Q1 = 8950 J

Heat discard, Q2 = 6150 J

(a) Work = intake heat energy - discarded heat energy

W = Q1 - Q2 = 8950 - 6150 = 2800 J

(b) Efficiency = 1 - Q2 / Q1

Efficiency = 1 - (6150 / 8950) = 0.3128 = 31.28%

4 0
3 years ago
Como se da la transferencia de energia entre los objetos?
tensa zangetsu [6.8K]
El calor es la transferencia de energía de un objeto más cálido a un objeto más fresco. El calor puede transferirse de tres maneras: por conducción, por convección y por radiación. La conducción es la transferencia de energía de una molécula a otra por contacto directo.
6 0
3 years ago
Which particle is used as a beam to treat cancer?
larisa [96]
Proton beams are what is used to treat cancer
5 0
3 years ago
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