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
RSB [31]
3 years ago
10

What is meant by cathode rays?what is radio activity and state three of it's effects?​

Physics
1 answer:
stealth61 [152]3 years ago
5 0

1cathode rays plural : the high-speed electrons emitted in a stream from the heated cathode of a vacuum tube

2: a stream of electrons emitted from the cathode of a vacuum tube —usually used in plural

You might be interested in
Why might scientists measure the mass of object rather than the weight of an object?
Marina CMI [18]
Because they have different measurements and weight and mass and some measurements are the same

3 0
3 years ago
What is the average power supplied by a 60.0 kg secretary running up a flight of stairs rising vertically 4.0 m in 4.2 s?
gayaneshka [121]

Answer:

9.8kW

Explanation:

Given data

Mass= 60kg

Hieght= 4m

Time= 4.2seconds

We know that the energy possessed is given as

PE=mgh

PE=60*9.81*4

PE= 2354.4 Joulse

Also, the expression for power is

Power=Energy*Time

Power= 2354.4*4.2

Power=9888.48 watt

Power= 9.8kW

4 0
3 years ago
A cabbie is trying to stop when he notices a fare is whistling them over. The
liberstina [14]
  • K.E=18750J
  • Mass=m=2100kg
  • Velocity=v

\boxed{\sf K.E=\dfrac{1}{2}mv^2}

\\ \sf\longmapsto 18750=\dfrac{1}{2}2100v^2

\\ \sf\longmapsto 18750=1050v^2

\\ \sf\longmapsto v^2=\dfrac{18750}{1050}

\\ \sf\longmapsto v^2=17.85m^2

\\ \sf\longmapsto v=\sqrt{17.85}

\\ \sf\longmapsto v=4.1m/s

7 0
3 years ago
Nonmetals in the periodic table have a negative oxidation number. Which statement best explains why?
Tema [17]
They have a negative oxidation number because nonmetals gain electrons, thus making them negatively charged ions (anions). Metals become cations and have a positive charge because they lose electrons.
7 0
3 years ago
A mass weighing pounds is attached to a spring whose constant is lb/ft. The medium offers a damping force that is numerically eq
andreyandreev [35.5K]

Answer:

hello your question has some missing values attached below is the complete question with the missing values

answer :

a) 0.083 secs

b) 0.33 secs

c)  3e^-4/3

Explanation:

Given that

g = 32 ft/s^2 ,  spring constant ( k ) = 2 Ib/ft

initial displacement = 1 ft above equilibrium

mass = weight / g = 4/32 = 1/8

damping force = instanteous velocity  hence  β = 1

a<u>)Calculate the time at which the mass passes through the equilibrium position.</u>

time mass passes through equilibrium = 1/12 seconds = 0.083

<u>b) Calculate the time at which the mass attains its extreme displacement </u>

time when mass attains extreme displacement = 1/3 seconds = 0.33 secs

<u>c) What is the position of the mass at this instant</u>

position = 3e^-4/3

attached below is the detailed solution to the given problem

6 0
3 years ago
Other questions:
  • An Iowa class warship holds the record for the fastest warship. If the ship accelerates uniformly from rest at 0.15 m/s² for 2 m
    8·1 answer
  • A mass m neutron has elastic collision with a mass m'
    8·1 answer
  • A rock is thrown upward from level ground in such a way that the maximumheight of its flight is equal to its horizontal rangeR.
    6·1 answer
  • A book is moved once around the edge of a tabletop with dimensions 1.75 m à 2.25 m. If the book ends up at its initial position,
    10·1 answer
  • PLEASE HELP!!! URGENTTT
    7·1 answer
  • 9. All of the following are adaptations of herbivores EXCEPT:
    9·1 answer
  • Select the correct answer.
    8·2 answers
  • What I didn't even cross 1000 , how it can be possible...​
    15·1 answer
  • Human sense impressions are subjective and qualitative
    13·1 answer
  • What is the speed of a wave with a frequency of 2 Hz and a wavelength of 87 m?​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!