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
Alex73 [517]
3 years ago
7

Một nười thả 420g chì ở nhiệt độ 100°C và 260g nước ở nhiệt độ 58°C làm cho nước nóng lên tới 60°C . Cho nhiệt dung riêng của nư

ớc là 4200J/kg.K và bảo qua sự hao phí nhiệt ra môi trường bên ngoài . Hãy tính :
a) Nhiệt độ của chì khi có cân bằng nhiệt

b) Nhiệt lượng nước đã thu vào

c) Nhiệt dung riêng của chì

d) Nếu muốn nước và chì nóng tới nhiệt độ 75°C thì cần thêm vào một lượng chì ở nhiệt độ 150°C là bao nhiêu ?
Physics
1 answer:
vlabodo [156]3 years ago
6 0
Hey what language is this?
You might be interested in
An electron has a constant acceleration of +3.3 m/s2. at a certain instant its velocity is +8.6 m/s. what is its velocity (a) 2.
Citrus2011 [14]
Hello!


The velocity function is:

\mathsf{V = V_0 + at}\\ \\ \mathsf{V = 8.6 +3.3t}


a) 2.3 s earlier, we can make t = -2.3 s, in relation to our initial time:

\mathsf{V = 8.6 + 3.3\cdot(-2.3)}\\ \\ \mathsf{V = 8.8-7.59}\\ \\ \boxed{\mathsf{V = 1.21 \ m/s}}

b) Now we can make t = 2.3 s:

\mathsf{V = 8.6 + 3.3\cdot2.3}\\ \\ \mathsf{V = 8.6 + 7.59}\\ \\ \boxed{\mathsf{V = 15.59 \ m/s}}
7 0
3 years ago
A comet is traveling through space with speed 3.01 ✕ 104 m/s when it encounters an asteroid that was at rest. The comet and the
Tcecarenko [31]

Answer: 8.493(10)^{-3} m/s

Explanation:

According to the conservation of linear momentum principle, the initial momentum p_{i} (before the collision) must be equal to the final momentum p_{f} (after the collision):

p_{i}=p_{f} (1)

In addition, the initial momentum is:

p_{i}=m_{1}V_{1}+m_{2}V_{2} (2)

Where:

m_{1}=1.71(10)^{14} kg is the mass of the comet

m_{2}=6.06(10)^{20} kg is the mass of the asteroid

V_{1}=3.01(10)^{4} m/s is the velocity of the comet, which is positive

V_{2}=0 m/s is the velocity of the asteroid, since it is at rest

And the final momentum is:

p_{f}=(m_{1}+m_{2})V_{f} (3)

Where:

V_{f} is the final velocity

Then :

m_{1}V_{1}+m_{2}V_{2}=(m_{1}+m_{2})V_{f} (4)

Isolating V_{f}:

V_{f}=\frac{m_{1}V_{1}}{m_{1}+m_{2}} (5)

V_{f}=\frac{(1.71(10)^{14} kg)(3.01(10)^{4} m/s)}{1.71(10)^{14} kg+6.06(10)^{20} kg}

Finally:

V_{f}=8.493(10)^{-3} m/s This is the final velocity, which is also in the positive direction.

8 0
3 years ago
Help and show work thanks
Zepler [3.9K]
Well its C, cant show you the work its in my head sorry.
6 0
2 years ago
If another vehicle is trying to pass your vehicle,
Vladimir [108]

Answer:

Reduce you're speed, and let the other vehicle pass you

8 0
3 years ago
Does it take more force to slow something down than to speed it up.
ANTONII [103]
To bring something to a stop the same force that was applied to speed it up can be used to stop it. If a greater force is used it will stop quicker.
7 0
3 years ago
Other questions:
  • A helium balloon rises because helium is dense than air
    10·2 answers
  • You notice the flagpole at school vibrating in the breeze. You count the vibrations and find that
    10·1 answer
  • 3.
    8·2 answers
  • a) If a proton moved from a location with a 5.0 V potential to a location with 7.5 V potential, would its potential energy incre
    13·1 answer
  • Is the refractive index constant?
    9·2 answers
  • The deepest point of the pacific ocean is 11,033 m, in the mariana trench. what is the gauge pressure in the water at that point
    6·1 answer
  • Show that a light ray that strikes two mutually perpendicular reflecting surfaces is reflected back exactly parallel to the dire
    5·1 answer
  • As the frequency of the ac voltage across a capacitor approaches zero, the capacitive reactance of that capacitor:_______.
    10·1 answer
  • The resolving power of a microscope is proportional to the wavelength used. A resolution of 1.0 10-11 m (0.010 nm) would be requ
    7·1 answer
  • Suppose that a 710 kg car is traveling at 13 m/s. Its brakes can apply a force of 4000 N.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!