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
Anna35 [415]
2 years ago
10

I'll give you a BRAINLIEST if you help me with these questions and they have to be correct.

Physics
1 answer:
irina1246 [14]2 years ago
7 0
2. 3 I think I’m not sure
You might be interested in
Professional Application: A 30,000-kg freight car is coasting at 0.850 m/s with negligible friction under a hopper that dumps 11
Nataliya [291]

Answer:

0.182 m/s

Explanation:

m1 = 30,000 kg, m2 = 110,000 kg, u1 = 0.85 m/s

let the velocity of loaded freight car is v

Use the conservation of momentum

m1 x u1 + m2 x 0 = (m1 + m2) x v

30,000 x 0.85 = (30,000 + 110,000) x v

v = 0.182 m/s

5 0
3 years ago
Much of the energy of falling water in a waterfall is converted into heat. If all the mechanical energy is converted into heat t
Assoli18 [71]

Answer:

Explanation:

potential energy of water is converted into heat energy

P E = mgh = m x 9.8 x 111

= 1087.8 m .

Let rise in temperature θ

m x s x θ = heat absorbed

m x s x θ =  1087.8 m

m x 4182 x θ =  1087.8 m

θ = 0.26 degree celsius .

6 0
3 years ago
6. A 2.2 kg rock rests on the edge of a bridge that is 3.3 m above a river. What is the
vovikov84 [41]

Answer: 71 J

Explanation: The formula for gravitational potential energy is Epg= mgh.

So you plug in 2.2 as m, 3.3 as h and 9.81 as g. Once you do that you should get an answer of 71.2206. But because there are only two significant digits in the question, your answer must also have two significant digits.

6 0
3 years ago
Hydroelectric plants use __________ to produce electricity. A. fire B. sunlight C. water D. wind
xz_007 [3.2K]
"Hydro..." means "water".  Hydroelectric plants use the kinetic energy
of falling water to produce electrical energy. 

I wouldn't exactly say that they "use water", because after they produce
the electrical energy, there's still just as much water as there was before.
3 0
3 years ago
Read 2 more answers
An isolated, irregularly shaped piece of platinum carries -8.89 × 10-9 C of charge and is in electric equilibrium. The size of t
rusak2 [61]

Answer:

c) equals V

Explanation:

This is because, since the isolated, irregularly shaped piece of platinum is in electric equilibrium, the electric potential at all points on its surface is V. So that, the potential difference across any point is zero. This implies that diametrically opposite sides have the same potential and thus, the potential at other points of the surface is V since it is in electric equilibrium.

5 0
2 years ago
Other questions:
  • Which weather event is capable of destroying homes and uprooting trees due to a low pressure area at its center
    15·2 answers
  • A 0.49-kg cord is stretched between two supports,7.3m apart. When one support is struck by a hammer, a transverse wave travels d
    12·1 answer
  • To determine a waves' frequency, you must know the
    15·1 answer
  • (a) At what height above Earth’s surface is the energy required to lift a satellite to that height equal to the kinetic energy r
    8·1 answer
  • Suppose you increase your walking speed from 7 m/s to 11 m/s in a period of 1 s. What is your acceleration?
    15·1 answer
  • Which direction will heat be transferred?
    13·2 answers
  • a student holds a 3.0kg mass in each hand while sitting on a rotating stool. when his arms are extended horizontally, the masses
    11·1 answer
  • What is the least dense planet in our solar system?.
    15·1 answer
  • Calculate the speed for a car that went a distance of 125 meters in 2 seconds time.
    9·1 answer
  • An object traveling at a constant
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!