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
REY [17]
2 years ago
5

A) Khi nào một vật được coi là chuyển động ? Cho ví dụ ?

Physics
1 answer:
Lady bird [3.3K]2 years ago
3 0

Answer: ) Khi nào một vật được coi là chuyển động ? Cho ví dụ ?

b) Khi nào một vật coi là đứng yên? Cho ví dụ ?

c) Theo em câu phát biểu “ Khi khoảng cách từ vật đến vật mốc không thay đổi theo thời gian thì vật đứng yên so với vật mốc”. Có luôn đúng không, vì sao?

Explanation:

You might be interested in
If you walk 3 kilometers in 30 minutes , what is the average speed in kilometers per hour?
Pepsi [2]

Answer:

6 km/h

Explanation:

V avg = ∆x/∆t = 3km / 30 min ×(60min/1h) = 3 km× 2 /h = 6 km/h

4 0
2 years ago
A child is holding a cup of hot tea. His mother, a physicist, warns him not to start running with the tea. According to Newton's
nalin [4]
If he stops running the tea is still going to be moving so it will spill on him.
3 0
3 years ago
Two electrons with a charge of magnitude 1.6×10-19 C in an atom are separated by 1.5×10-10 m, the typical size of an atom. What
vesna_86 [32]

Answer:

1.02\cdot 10^{-8} N, repulsive

Explanation:

The magnitude of the electric force between two charged particles is given by Coulomb's law:

F=k\frac{q_1 q_2}{r^2}

where:

k=8.99\cdot 10^9 Nm^{-2}C^{-2} is the Coulomb's constant

q_1, q_2 are the two charges of the two particles

r is the separation between the two charges

The force is:

- repulsive if the two charges have  same  sign

- Attractive if the two charges have opposite signs

In this problem, we have two electrons, so:

q_1=q_2=1.6\cdot 10^{-19}C is the magnitude of the two electrons

r=1.5\cdot 10^{-10} m is their separation

Substituting into the formula, we find the electric force between them:

F=(8.99\cdot 10^9)\frac{(1.6\cdot 10^{-19})^2}{(1.5\cdot 10^{-10})^2}=1.02\cdot 10^{-8} N

And the force is repulsive, since the two electrons have same sign charge.

4 0
3 years ago
To meet the minimum required instrument flight experience to act as a pilot in command of an aircraft under IFR, you must have l
lora16 [44]
I think its a tbh bc it seems to be the best answer out of a b c and d
6 0
3 years ago
An airplane starts from rest at the end of a runway and accelerates at a constant rate. In the first second, the airplane travel
Licemer1 [7]

Answer:

v=4.44\frac{m}{s}

Explanation:

Given that the airplane starts from the rest (this is initial velocity equals to zero)  and accelerates at a constant rate, position can be described like this: x=v_{0}t +\frac{1}{2} at^{2} where x is the position, t is the time a is the acceleration and v_{0} is initial velocity. In this way acceleration can be found. a=\frac{2(x-v_{0}t) }{t^{2} } =\frac{2(1.11m-0)}{1s^{2} } =2.22\frac{m}{s^{2} }.

Now we are able to found velocity at any time with the formula: v=v_{0} +at = 0\frac{m}{s} +(2.22\frac{m}{s^{2}}.2s)=4.44\frac{m}{s}

3 0
3 years ago
Other questions:
  • One cubic foot of water can store 312btu. a home requires 100,000 what is the volume​
    8·1 answer
  • What is the impulse of a 1700 kg truck traveling at 22.5 m/s?
    14·1 answer
  • Minerals that form from magma process will tend to form ?
    15·1 answer
  • In which physical state would a water molecule most likely have the least energy?
    15·2 answers
  • Help me plz the question was which wave has the highest pitch​
    5·2 answers
  • The average kinetic energy of the molecules of an ideal gas is directly proportional to the
    14·1 answer
  • Uses and effects of UV rays? ​
    14·1 answer
  • A uniform solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4
    7·1 answer
  • Two spheres of equal mass, A and B. are projected off the edge of a 2.0 m bench. Sphere A has a horizontal velocity of 5.0 m/s a
    5·1 answer
  • How to behave in classroom​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!