A bus traveled down Interstate 35 at a speed of 75 km/h for 4 hours. How many kilometers was the bus speeding?

Planet X has three times the free-fall acceleration of Earth.

serious [3.7K]

Answer:

a) The ball goes one-third times higher on X

b) The ball goes three times higher on X.

Explanation:

a)

As the initial velocity is the same than on Earth, but the free-fall acceleration is three times larger, this means that the only net force acting on the ball (gravity) will be three times larger, so it is clear that the ball will reach to a lower height, as it will slowed down more quickly.
Kinematically, as we know that the speed becomes zero when the ball reaches to the maximum height, we can use the following kinematic equation:

$v_{f} ^{2} - v_{o}^{2} = 2* \Delta h* g$

since vf = 0, solving for Δh, we have:

$\Delta h = h_{max} =\frac{v_{o} ^{2}}{2*g} (1)$

if v₀ₓ = v₀E, and gₓ = 3*gE, replacing in (1), we get:

Δhₓ = 1/3 * ΔhE

which confirms our intuitive reasoning.

b)

Now, if the initial velocity is three times larger than the one on Earth, even the acceleration due to gravity is three times larger, we conclude that the ball will go higher than on Earth.
We can use the same kinematic equation as in (1) replacing Vox by 3*VoE, as follows:

$\Delta h = h_{max} =\frac{(3*v_{o}) ^{2}}{2*3*g} (2)$

Replacing the right side of (1) in (2), we get:

Δhx = 3* ΔhE

which confirms our intuitive reasoning also.

7 0

3 years ago

The demand equation for the Roland portable hairdryer is given as follows where x (measured in units of a hundred) is the quanti

lesya [120]

Answer:

Explanation:

The concept of elastic and inelastic demand is applied.

for an elastic demand, the elasticity must be greater than 1 and for an Inelastic demand, the elasticity must be less than 1.

The steps and appropriate calculation is as shown in the attached file.

6 0

4 years ago

What happens when you throw a basketball up toward the hoop? If you are lucky, the ball sinks into the net. You score two points

Ray Of Light [21]

Answer:

What happens when you throw a basketball up

toward the hoop? If you are lucky, the ball sinks

into the net, scoring two points before dropping

back down to the ground. The basketball isn’t

that heavy, so why doesn’t it stay up in the air

<h2>when you throw it? Have you ever heard the</h2>

saying, “What comes up must come down”?

This saying is a simple explanation for what

causes the basketball to fall back to the ground.

It is being acted on by an invisible force called

gravity, which is the basic force in the universe

that attracts all objects to each other.

1 Gravity has existed since the beginning of the universe. It is hard to understand how or why it

works, but we know it is always there because it holds everything in the universe in place. First,

you need to understand that there is a gravitational attraction between you and Earth, between

Earth and the Moon, and between Earth and the Sun. Even though you can’t feel it, the

gravitational attraction between you and Earth is what keeps your feet planted firmly on the

ground. Imagine spinning around and around on a merry-go-round. As long as you are holding

on, then you stay on the merry-go-round, but if you ever let go, you will fly off and land on the

ground. This is a useful analogy in visualizing the gravitational attraction between Earth and

you. Earth is spinning on its axis and thanks to gravity, you are held to your position on Eart

rather than flying out into space. Explanation: this is what i can do!:)

8 0

3 years ago

Read 2 more answers

What is the effect on an electric current when the voltage is increased? An increase in voltage causes the flow of electric curr

Zina [86]

the answer is increase.

3 0

3 years ago

Read 2 more answers

How do you complete this circuit?

ale4655 [162]

Explanation:

jejjwnwjejjejejejejrhnrn noe

7 0

4 years ago