1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Dennis_Churaev [7]
4 years ago
5

A Scalar can only be a positive quantity that has a magnitude but no direction ? a)-True b)-False

Engineering
1 answer:
Bogdan [553]4 years ago
8 0

false

im not sure

but they haven't a direction

You might be interested in
/ Air enters a 20-cm-diameter 12-m-long underwater duct at 50°C and 1 atm at a
Digiron [165]

Answer:

A) EXIT TEMPERATURE = 14⁰C

b) rate of heat transfer of air = - 13475.78 = - 13.5 kw

Explanation:

Given data :

diameter of duct = 20-cm = 0.2 m

length of duct = 12-m

temperature of air at inlet= 50⁰c

pressure = 1 atm

mean velocity = 7 m/s

average heat transfer coefficient = 85 w/m^2⁰c

water temperature = 5⁰c

surface temperature ( Ts) = 5⁰c

properties of air at 50⁰c and at 1 atm

= 1.092 kg/m^3

Cp = 1007 j/kg⁰c

k = 0.02735 W/m⁰c

Pr = 0.7228

v  = 1.798 * 10^-5 m^2/s

determine the exit temperature of air and the rate of heat transfer

attached below is the detailed solution

Calculate the mass flow rate

= p*Ac*Vmean

= 1.092 * 0.0314 *  7 = 0.24 kg/s

4 0
3 years ago
What are some things that AREN’T manufactured
snow_lady [41]
Ray Bans
Arrow Shirts
Gillette
3 0
3 years ago
An AM radio transmitter radiates 550 kW at a frequency of 740 kHz. How many photons per second does the emitter emit?
kifflom [539]

Answer:

1121.7 × 10³⁰ photons per second

Explanation:

Data provided in the question:

Power transmitted by the AM radio,P = 550 kW = 550 × 10³ W

Frequency of AM radio, f = 740 kHz = 740 × 10³ Hz

Now,

P = \frac{NE}{t}

here,

N is the number of photons

t is the time

E = energy = hf

h = plank's constant = 6.626 × 10⁻³⁴ m² kg / s

Thus,

P = \frac{NE}{t} = \frac{N\times(6.626\times10^{-34}\times740\times10^{3})}{1}          [t = 1 s for per second]

or

550 × 10³ = \frac{N\times(6.626\times10^{-34}\times740\times10^{3})}{1}

or

550 = N × 4903.24 × 10⁻³⁴

or

N = 0.11217 × 10³⁴ = 1121.7 × 10³⁰ photons per second

7 0
3 years ago
A parallel circuit with two branches and an 18 volt battery. Resistor #1 on the first branch has a value of 220 ohms and resisto
likoan [24]

Answer:

  2.455 W

Explanation:

The power dissipated in each branch is ...

  P = V^2/R

So, the branch powers are ...

  branch 1: 18^2/220 ≈ 1.473 W

  branch 2: 18^2/330 ≈ 0.982 W

Total power is ...

  1.473 W + 0.982 W = 2.455 W

8 0
3 years ago
What engineers call moment, scientists call
Svet_ta [14]

Answer:

yes

Explanation:

7 0
3 years ago
Other questions:
  • Tranquilizing drugs that inhibit sympathetic nervous system activity often effectively reduce people's subjective experience of
    8·1 answer
  • Kim is assigned to write an important company report with Philip and Tara, her coworkers. Because Kim prefers to work alone, she
    13·1 answer
  • 1. The area of the given triangle is 25 square units. What is the value of x?<br> X+2
    8·1 answer
  • Steam enters a turbine with a pressure of 30 bar, a temperature of 400 oC, and a velocity of 160 m/s. Saturated vapor at 100 oC
    11·1 answer
  • What is the line called that has the red arrow pointing to it in the attached picture?
    6·1 answer
  • Water vapor at a rate of 40,000 kg/h and at 8 MPa and 500 C enters an adiabatic turbine and leaves the turbine at 40 kPa as satu
    8·1 answer
  • Create a story with nuclear engineer (not so long and not so short)
    13·1 answer
  • During a storm, gage station A was inoperative but the surrounding stations, B, C, and D, recorded rainfall of 5.2, 4.5, and 6.1
    14·1 answer
  • The metric unit of electrical power is the _____.<br><br> ampere<br> ohm<br> volt<br> watt
    7·2 answers
  • When are we going to abandon internal combustion engines?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!