Atoms with atomic number ____ or less will not undergo fission.

URGENT PLEASE HELP!! what are two things that can reduce the impact of a collision?

LenKa [72]

No distractions
Paying attention

4 0

3 years ago

Read 2 more answers

PpA hollow plastic ball is projected into the air.

LenKa [72]

a > g , is the best shows the magnitude a and the direction of the ball's acceleration at time.

<h3>What is acceleration?</h3>

Acceleration is the rate at which the speed and direction of a moving object change over time. A point or object travelling in a straight path is accelerated if it accelerates or decelerates. Even if the speed is constant, motion on a circle is accelerated because the direction is always changing.

Given data

The velocity of the ball is: V

The angle of velocity with the horizontal is (θ) = 45

The acceleration of the ball is: a

The acceleration due to gravity is: g

When the hollow ball is projected into the air, air resistance will act on the ball that will slow down the ball's motion. Therefore the velocity direction is opposite to the reducing force. The reducing force relates to the opposite to the acceleration of the hollow ball.

F(delaying) ∝ -VF(delaying) ∝ m×a(r)×F(delaying) ∝ a(r)

Here m is the mass of the hollow ball.

The force of gravity on the ball which is acting downward given as:

F(gravity) ∝ g

So, a > g

Correct option: (B)

To know more about acceleration refer to:

brainly.com/question/460763

#SPJ1

4 0

1 year ago

WILL MARK AS BRAINLIEST

Ludmilka [50]

<h3>Answer;</h3>

Only some metals are attracted by magnets; these metals are called ferromagnetic.

<h3>Explanation;</h3>

Magnets are those materials that have the ability of producing magnetic field. Magnets attracts materials called magnetic materials and have no effect on non magnetic materials such as wood.
Magnetic materials are materials that are attracted by a magnet, these includes some metal such as iron and steel. However some metals are non-magnetic materials, these include, gold, silver, and copper among others,
Therefore, it would be appropriate to say that only some metals are attracted by magnets; these metals are called ferromagnetic.

5 0

3 years ago

An Olympic runner competing in a long-distance event finishes with a time of 2 hours, 45 minutes, and 35 seconds. The event has

Readme [11.4K]

Answer:

Average speed of Olympic runner will be 23.08 km/hr

Explanation:

We have given distance d = 27.3 miles

We know that 1 mile = 1.6 km

So 27.3 mile = $=27.3\times 1.6=43.68km$

Given time = 2 hour 45 minutes and 35 sec

We know that 1 hour = 60 minutes

So 45 minutes $=\frac{45}{60}=0.75hour$

We also know that 1 hour = 3600 sec

So 1 sec $=\frac{1}{3600}=2.777\times 10^{-4}hour$

So total time t = $=2+0.75+0.000277=2.750277hour$

We know that speed $=\frac{distance}{time }=\frac{63.48}{2.750277}=23.08km/hour$

6 0

4 years ago

You are trying to determine the specific gravity of a solid object that floats in water. If m is the mass of your object, mS is

Alisiya [41]

Answer:

Specific Gravity = m/[m(s)-m(os)]

Explanation:

Specific gravity, also called relative density, is the ratio of the density of a substance to the density of a reference substance. By this definition we need to find out the ratio of density of the object of mass m to the density of the surrounding liquid.

m = mass of the object

Weight in air

W (air) = mg, where g is the gravitational acceleration

Weight with submerged with only one mass

m(s)g + Fb = mg + m(b)g, consider this to be equation 1

where Fb is the buoyancy force

Weight with submerged with both masses

m(os)g + Fb’ = mg + m(b)g, consider this to be equation 2

equation 1 – equation 2 would give us

m(s)g – m(os)g = Fb’ – Fb

where Fb = D x V x g, where D is the density of the liquid the object is submerged in, g is the force of gravity and V is the submerged volume of the object

m(s)g – m(os)g = D(l) x V x g

m(s) – m(os) = D(l) x V

we know that Mass = Density x V, which in our case would be, D(b) x V, which also means

V = Mass/D(b), where D(b) is the density of the mass

Substituting V into the above equation we get

m(s) – m(os) = [D(l) x m)/ D(b)]

Rearranging to get the ratio of density of object to the density of liquid

D(b)/D(l) = m/[m(s)-m(os)], where D(b)/D(l) denotes the specific gravity

8 0

3 years ago