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
never [62]
3 years ago
9

A ball is accelerating down a hill. Which statement is true?

Physics
1 answer:
Andrew [12]3 years ago
8 0

Answer:

The potential energy increases and the kinetic energy decreases

You might be interested in
The electric field of a sinusoidal electromagnetic wave obeys the equation E=(375V/m)cos[(1.99×107rad/m)x+(5.97×1015rad/s)t].a.
andrey2020 [161]

Answer:

A) max = Eo = 375 V/m, B)  B = 125 10⁻⁸ T , C) f = 9.50 101⁴ Hz, D) λ = 3.158 10⁻⁷ m, E)  T = 1.05 10⁻¹⁵ s , F) invisible for humans   G)  v = c = 3 10⁸ m/s

Explanation:

The expression given for the electric field is

       E = 375 cos (1.99 107x + 5.97 105t)

The general formula for the electric field of a transverse traveler is

     E = Eo cos (kx-wt)

Where k is the wave number and w the angular velocity

A) The amplitudes as electric is

     Emax = Eo = 375 V / m

B) the electric and magnetic field are related

     E / B = c

     B = E / c

     B = 375/3 108

     B = 125 10⁻⁸ T

C) angular velocity and frequency is related

    .w = 2π f

     f = w / 2π

     f = 5.97 10¹⁵ / 2π

     f = 9.50 101⁴ Hz

D) the speed of light has the formula

      c = λ f

      λ = c / f

      λ = 3 10⁸ / 9.50 10¹⁴

      λ = 3.158 10⁻⁷ m

E) The period

     T = 1 / f

     T = 1 / 9.5 10¹⁴

     T = 1.05 10⁻¹⁵ s

F) let's reduce the wavelength nm

   λ = 3.158 10⁻⁷ m (10⁹nm / 1m)

   λ = 3.158 10²nm = 315.3 nm

The visible radiation range is between 400nm and 700nm. This radiation is ultraviolet and is invisible humans

G) All electromagnetic radiation has a speed at the speed of light (c)

      v = c = 3 10⁸ m/s

5 0
3 years ago
In the year 2000, a company made $4.7 million in profit. For each consecutive year after that, their profit increased by 15%. Ho
olya-2409 [2.1K]

Answer: $8.2 million.

Explanation:

If we have a quantity A, and we have an increase of x%, this can be written as:

A + (x%/100%)*A

Now, for this particular case we have:

In year 2000 (we can define this year as the year zero, y = 0) the initial value is $4.7 million.

The next year, y = 1, there is an increase of 15%, then we will have a profit of:

P = $4.7 million + (15%/100%)*$4.7 million = $4.7 million +  0.15*$4.7 million

P = $4.7 million*(1 + 0.15) = $4.7 million*(1.15)

in the next year, y = 2, the profit will be:

P =  $4.7 million*(1.15) + (15%/100%)* $4.7 million*(1.15)

  = $4.7 million*(1.15) + 0.15* $4.7 million*(1.15)

   = $4.7 million*(1.15)^2

We already can see the pattern, the profit in the year y will be:

P(y) = $4.7 million*(1.15)^y

In particular, in the year 2004 we have y = 4, then the profit that year will be:

P(4) = $4.7 million*(1.15)^4 = $8.2 million.

8 0
3 years ago
What kind of radiation is emitted in the following nuclear reaction
miv72 [106K]

Beta emission is occurring in the given nuclear reaction.

Answer: Option B

<u>Explanation:</u>

In this equation, the reactant is the Thorium atom, which is reduced to palladium. As the atomic number get decreased by one, so an electron will be emitted. This process of emission of electrons by radiation or decaying the reactant nuclei to form a new product nuclei is termed as beta emission.

So, the electrons are generally termed as beta particles while the positrons are termed as positive beta particles. So this is a kind of radioactive reactions where the reactant changes to new element by releasing an electron and thus there is a change in the atomic number of the product by one.

4 0
3 years ago
In the compound MgCl2, how many atoms of Mg are there?
Aleksandr [31]
There is 1 Mg and 2 Cl i think
3 0
3 years ago
The instant before a batter hits a 0.14-kilogram baseball, the velocity of the ball is 45 meters per second west. The instant af
NemiM [27]

(1) The magnitude and direction of the average acceleration of the baseball while it is in contact with the bat is 8,000 m/s² east.

(2) The magnitude of the average force the Bat exerts on the ball while they are in contact is 1,120 N.

The given parameters:

  • <em>Mass of the baseball, m = 0.14 kg</em>
  • <em>Initial velocity of the baseball, u = 45 m/s west (negative direction)</em>
  • <em>Final velocity of the baseball, v = 35 m/s east (positive direction)</em>
  • <em>Time of contact, t = 0.01 s</em>

The magnitude and direction of the average acceleration of the baseball while it is in contact with the bat is calculated as follows:

a = \frac{v- u}{t} \\\\a = \frac{35 - (-45)}{0.01} \\\\a = \frac{80}{0.01} \\\\a = 8,000 \ m/s^2

The magnitude of the average force the Bat exerts on the ball while they are in contact is calculated as follows;

F = ma\\\\F = 0.14 \times 8,000\\\\F = 1,120 \ N

Learn more about average force here: brainly.com/question/16200276

4 0
2 years ago
Other questions:
  • Why is friction a problem in space travellers​
    13·1 answer
  • A machine is device that____.
    7·1 answer
  • To run the physics cart, the fan speed of the cart is manipulated. This is the variable. The cart accelerates due to the speed o
    5·2 answers
  • the radius of the tires on a particular vehicle 0.62m if the tires are rotating 5 times per second, what is the velocity of the
    12·1 answer
  • An electric heater is rated 1000watts. If a current of 5A pass through the heater, find the value of its resistance.​
    11·1 answer
  • (1.5 pts) A woman pushes on a box to the left. If the box is accelerating, what forces are working on the
    15·1 answer
  • Juan rides his horse with a constant<br> speed of 18 km/h. How far can he travel<br> in 1/2 hour?
    10·1 answer
  • there are 3 balls , ball 1 has a mass of 2 kg ,ball number 2 has a mass of 0.5 kg, and ball number 3 has the mass of 0.02 kg ...
    7·1 answer
  • Calculate the radiative and collisional energy losses (in keV/micron) for a 1.9 MeV electron in lead and determine the rad./coll
    6·1 answer
  • If i eat myself will I get twice as big or disappear completely?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!