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kvasek [131]
3 years ago
15

Two cannonballs are dropped from a second-floor physics lab at height h above the ground. Ball B has four times the mass of ball

A. When the balls pass the bottom of a first-floor window at height above the ground, the relation between their kinetic energies, KA and KB, is
Physics
1 answer:
denpristay [2]3 years ago
3 0

Answer:

1:4

Explanation:

The formula for calculating kinetic energy is:

KE=\dfrac{1}{2}mv^2

If the mass is multiplied by 4, then, the kinetic energy must be increased by 4 as well. Since they will be travelling at the same speed when they are at the same point, the relation between KA and KB must be 1:4 or 1/4. Hope this helps!

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Compare the KE of an 80 kg person walking at 4 m/s with that of the same person moving at 6 m/s.
Alla [95]
The correct answer is:
<span>KE at 4 m/s less than KE at 6 m/s

In fact, the formula for the kinetic energy is:
</span>K= \frac{1}{2} mv^2
<span>where m is the mass of the person and v his speed.

When the person is moving at 4 m/s, his kinetic energy is:
</span>K= \frac{1}{2} (80 kg)(4 m/s)^2=640 J
instead, when he's moving at 6 m/s, his kinetic energy is:
K= \frac{1}{2}(80 kg)(6 m/s)^2=1440 J

So, the kinetic energy at 4 m/s is less than the kinetic energy at 6 m/s.
7 0
3 years ago
Match each scientist with the contribution he made to the arrangement of elements in the periodic table
Sergeeva-Olga [200]
  • Dmitri Mendeleev- arranged elements according to their

atomic mass

  • Johann Wolfgang Dobereiner-created groups of three elements,

each based on similar properties

  • John Newlands-used patterns to predict undiscovered

elements

  • Antoine Lavoisier-divided elements into four categories

Explanation:

The periodic table or the table depicting the arrangement of various elements has a long history. Several of the scientist starting from Lavoisier to Mendeleev contributed to the table in their might. The present table has been an evolution of the previous tables over their shortcomings.

Some of the notable contributions include-

  • Mendeleev- Mendeleev arranged the elements in order of atomic mass rather than atomic mass. Through this, he also discovered new elements.
  • Newlands- He formulated the Newland law of octaves similar to musical notation.
  • Lavoisier- Lavoisier divided the elements into various categories and also defined elements.
  • Dobereiner- He formulated the triad law which encapsulated that certain group of elements showed similar properties, hence can be grouped together.

6 0
3 years ago
Read 2 more answers
A working fluid enters a steady flow system with a velocity of 30m/s and leaves at
Oxana [17]

Answer:

Pretty sure it’s A

Explanation:

Would ike brainliest

6 0
3 years ago
Object A has a charge q on it, object B has a charge q on it, and Object C has a charge 2q on it. These charges are arranged, on
navik [9.2K]

Answer: Option d.

Explanation:

The force between charges can be expressed as:

F = k*q1*q2/r^2

where k is a constant, q1 and q2 are the charges and r is the distance between them.

We hare in a equilateral triangle, so al the distances are equal.

and the charges are:

qa = q

qb = q

qc = 2q

Now, for example, the force that experiments charge A is (in the y axis)

F = (k*qa*qb/r^2 + k*qa*qc/r^2)*cos(30°) = cos(30°)*(q + 2q)*k*q/r^2 = cos(30°)*3*k*q^2/r^2

for charge B, the force is again, in the y axis.

F = (k*qb*qa/r^2 + k*qb*qc/r^2)*cos(30°) = cos(30°)*(q + 2q)*k*q/r^2 = cos(30°)*3*k*q^2/r^2

for particle C, we have:

F = (k*qc*qa/r^2 + k*qc*qb/r^2)*cos(30°) = cos(30°)*(q + q)*k*2q/r^2 = cos(30°)*4*k*q^2/r^2

Wher the cosine of 30° comes because we have a equilatiral triangle, where all the internal angles are 60°, so if we draw a line that cuts the angle by half (our y-axis) the angles to each side are 30°.

We can do a similar process for the forces in the x-axis, and we will reach the same conclusion:

Now, this means that the force that experiences the charge C is the biggest force, so the correct option is c.

5 0
3 years ago
Calculate the mmoi of a tire that weighs 15.0 kg and has a radius of 30.0 (treat it as a hoop )
lys-0071 [83]

Answer:

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Explanation:

6 0
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