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
Hitman42 [59]
3 years ago
12

Câu 1. Trường hợp nào dưới đây không phải là vật sáng?

Physics
1 answer:
Marianna [84]3 years ago
5 0

Answer:

A

Explanation:

A. The pencil is on the table in broad daylight

You might be interested in
The position of a car at time t is given by the function p(t)=t2 2t−4. What is the velocity when p(t)=11? assume t≥0
AysviL [449]

The velocity when function p(t)=11 is 8 .

According to the question

The position of a car at time t  represented by function :

p(t)=t^{2} +2t-4

Now,

When  function p(t) = 11 , t will be

p(t)=t^{2} +2t-4

11 = t²+2t-4

0 = t² + 2t - 15

or

t² +2t-15 = 0

t² +(5-3)t-15 = 0

t² +5t-3t-15 = 0

t(t+5)-3(t+5) = 0

(t-3)(t+5) = 0  

t = 3 , -5  

as t cannot be -ve as given ( t≥0)

so,

t = 3

Now,

the velocity when p(t)=11

As we know velocity = \frac{position}{time}

therefore to get the value of velocity from  function p(t)

we have to differentiate the function with respect to time

\frac{d(p(t))}{dt} =\frac{d}{dt} (t^{2} +2t-4)

v(t) = 2t + 2  

where v(t) = velocity at that time

as t = 3 for  p(t)=11  

so ,

v(t) = 2t + 2  

v(t) = 2*3 + 2  

v(t) = 8

Hence, the velocity when function p(t)=11 is 8 .

To know  more about function here:

brainly.com/question/12431044

#SPJ4

4 0
2 years ago
Iron-rich minerals in rock pointed in one direction and then switched to the exact opposite direction. This supports what idea?
NISA [10]
Iron rich minerals in rock pointed in one direction the switch to the exact opposite direction. I'd say that what supports this idea is that Earth's magnetic field goes through pole reversals.<span>
</span>
4 0
3 years ago
Read 2 more answers
When a customer in Japan was quoted a price of .39 cents a pound he thought he was being charged .39 a kilogram. He was shocked
Anon25 [30]

Answer: $85.80

Explanation: 100kg is equalvilent to 220 lbs, then you multiply 220 by .39 and then you have your answer :)

4 0
2 years ago
friction between the tire of a moving car and the dry pavement is: A. static B. rolling C. sliding D. riding
qwelly [4]

Answer:A static

Explanation:

6 0
3 years ago
I WILL MARK YOU THE BRAINLIEST NO LINKS AND IF YOU DONT UNDERSTAND THE QUESTION DONT ANSWER
elena-s [515]

Answer:

Perform a simple test of the material in the pan to assess whether it is real gold. Raw gold appears brassy yellow and bright. If you think it is gold, place your hand between it and the sun to create shade over the gold. If it still appears bright in the pan, chances are that it is real gold.

Explanation:

6 0
3 years ago
Other questions:
  • An object that weighs 2.450 N is attached to an ideal massless spring and undergoes simple harmonic oscillations with a period o
    8·1 answer
  • What two things can happen in the life of a massive star after it passes from the supernova stage?
    13·1 answer
  • What does the churning air in the troposphere help determine
    9·1 answer
  • Which of the following are true about centripetal force? Check all that apply. A. Without centripetal force, an object cannot ac
    8·2 answers
  • The escape velocity on earth is 11.2 km/s. What fraction of the escape velocity is the rms speed of H2 at a temperature of 31.0
    10·1 answer
  • A car runs along a horizontal path at speed of 20m/s.The driver observes the rain hitting his car at 60 to vertical.If rain is a
    12·1 answer
  • A truck contains both hydraulic brakes (reliability 0.96) and mechanical brakes (reliability 0.99). What is the probability of s
    13·1 answer
  • Obtain a volume of 12.5 millimeters of liquid in the diagram
    7·2 answers
  • A big wheel at a theme park has a diameter of 14m and people on the ride complete one revolution in 24s. calculate the distance
    15·1 answer
  • What factor contributes most to the kinetic energy of a body in motion
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!