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
Ray Of Light [21]
2 years ago
9

James is planning a science fair project on sound waves. He places an alarm inside a jar which he can remove the

Physics
1 answer:
otez555 [7]2 years ago
3 0

Answer: c

Explanation:

Sound waves cannot travel through a medium

You might be interested in
¿Qué nombre recibe un electrón que abandona el espacio interno del átomo dirigiéndose al exterior del átomo?
Alenkinab [10]

Answer:

i dont speack spanish sorry

Explanation: agian sorry

7 0
2 years ago
Which of the following holds true for volume if the temperature of a given amount of gas increases and pressure remains constant
svlad2 [7]
D. Volume will increase
Volume and temperature are directly proportional for a gas.
7 0
3 years ago
Read 2 more answers
An electron with speed 2.45 x 10^7 m/s is traveling parallel to a uniform electric field of magnitude 1.18 x 10^4N/C . How much
cupoosta [38]

Answer:

time will elapse before it return to  its staring point is 23.6 ns

Explanation:

given data

speed u = 2.45 × 10^{7} m/s

uniform electric field E = 1.18 × 10^{4} N/C

to find out

How much time will elapse before it returns to its starting point

solution

we find acceleration first by electrostatic force that is

F = Eq

here

F = ma by newton law

so

ma = Eq

here m is mass , a is acceleration and E is uniform electric field and q is charge of electron

so

put here all value

9.11 × 10^{-31} kg ×a = 1.18 × 10^{4} × 1.602 × 10^{-19}

a = 20.75 × 10^{14} m/s²

so acceleration is 20.75 × 10^{14} m/s²

and

time required by electron before come rest is

use equation of motion

v = u + at

here v is zero and u is speed given and t is time so put all value

2.45 × 10^{7} = 0 + 20.75 × 10^{14} (t)

t = 11.80 × 10^{-9} s

so time will elapse before it return to  its staring point is

time = 2t

time = 2 ×11.80 × 10^{-9}

time is 23.6 × 10^{-9} s

time will elapse before it return to  its staring point is 23.6 ns

7 0
3 years ago
A e B são dos blocos de massas 3,0 kg e 2,0 kg, respectivamente, que se movimentam juntos sobre uma superficie horizontal e perf
makvit [3.9K]

F = m*a

30 N = (ma + mb) * a

30 = 5*a

a = 6 m/s ^2

F de B em A

30 - F de B,A = ma * a

30 - F de B em A = 3 * 6

30 - 18 = F de B em A

12 = F de B em A


Resposta: 6 m/s^2 e 12N

Bate com o gabarito, man? Ou eu tô viajando aqui?

Abç!

6 0
3 years ago
Evaporation of sweat cools the skin because
Law Incorporation [45]

Answer: c. the molecules with the highest energy evaporate first, lowering the temperature of the sample

Explanation:

The process by which liquid starts to change into vapor phase at any temperature is known as evaporation.

During evaporation , the molecules which possess higher energies escape from the upper layer into vapor phase. the molecules which escape draw energy from surroundings and thus decrease the energy of the surroundings and hence lead to decrease in temperature.

As temperature of the system is directly proportional to the energy of the system , thus decrease in energy leads to decrease in temperature.

K.E=\frac{3RT}{2}

K.E. = Kinetic energy

T = temperature

R= gas constant

6 0
3 years ago
Other questions:
  • A car is moving 18 m/s to the east. if it takes the car 5 seconds to reach a velocity of 19 m/s to the east, what is its acceler
    14·2 answers
  • Two spheres A and B of negligible dimensions and masses 1 kg and √3 kg respectively, are supported on the smooth circular surfac
    9·1 answer
  • Anthony is deciding between different savings accounts at his bank. He has four options, based on how frequently interest compou
    8·1 answer
  • A 1,200 kg car rolls down a hill with its brakes off and transmission in neutral. At one moment it is moving 5.0 m/s. A little l
    7·1 answer
  • Climate characterized by mild temperatures is ______. Question 4 options: tropical humid dense temperate
    11·1 answer
  • A car is driving directly north on the freeway at a speed of 91 km/h and a truck is leaving the freeway driving 56 km/h in a dir
    8·1 answer
  • when a human cannon ball shoots in the air for 9 seconds, she travels 37 meters before ut lands. Caculate the speed​
    7·1 answer
  • PLEASE ANSWER! DESPERATE! WILL MARK BRAINLIEST!!
    12·1 answer
  • What is the net force in the following diagram?​
    9·1 answer
  • 14. measuring cylinder containing some water stands on a scale pan. A solid ball is lowered into the water. The water level rise
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!