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4 years ago

One ball is dropped vertically from a window. At the same instant, a second ball is thrown horizontally from the same window.

Physics

1 answer:

geniusboy [140]4 years ago

7 0

Answer:

The second ball

Explanation:

Both balls are under the effect of gravity, accelerating with exactly the same value. The first ball is dropped, therefore its initial velocity is zero. Since the second ball has horizontal and vertical velocity components, its initial velocity is given by:

$v=\sqrt{v_x^2+v_y^2}$

The vertical component is zero, however, it has a horizontal velocity, so its initial speed is not zero, therefore the secong ball has the greater speed at ground level.

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Fused quartz possesses an exceptionally low coefficient of linear expansion, 5.50 × 10 − 7 ( ∘ C ) − 1 . Suppose a bar of fused

kozerog [31]

To solve this problem we will use the concepts related to thermal expansion in a body for which the initial length, the coefficient of thermal expansion and the temperature change are related:

$\Delta L = L0\alpha\Delta T$

Where,

$\Delta L$ = Change in Length

$\alpha$ = Coefficient of linear expansion

$\Delta T$ = Change in temperature

$L_0$ = Initial Length

Our values are:

$L_0 = 3.45m$

$\alpha = 5.5*10^{-7} \°C^{-1}$

$\Delta T = 235-20 = 215\°C$

Replacing we have,

$\Delta L = (3.49) (5.5*10^{-7}) [(215)$

$\Delta L = 0.0004126m$

$\Delta L = 0.4126mm$

Therefore the change in milimiters was 0.4126mm

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3 years ago

A skydiver is preparing to jump out of a plane that is flying at a height of 2200 m. If the skydiver has a mass of 78 kg, what i

Illusion [34]

Answer:

1,681,680 J.

Explanation:

( ´･･)ﾉ(._.`)

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3 years ago

Each kidney contains nephrons that filter the blood and remove waste. Please select the best answer from the choices provided. T

bekas [8.4K]

Answer: The correct answer is "True".

Explanation:

Nephron is a functional unit of kidney. Each kidney contains a millions of nephrons. It contains small blood vessels.

It filters the blood to remove excess water and the waste product from the blood. Then, it returns the cleaned blood back to rest of the body. It selectively reabsorbs the substance such as glucose. It excretes nitrogenous waste such as urea. It removes excess salt in the form of urine.

Therefore, the given statement is true.

8 0

3 years ago

Read 2 more answers

How does the movement of particles of matter change when matter goes from solid to liquid?

icang [17]

Solid to liquid: molecules spread out to have their own spaces and move energetic and lively.

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3 years ago

An athlete stretches a spring an extra 40.0 cm beyond its initial length. how much energy has he transferred to the spring, if t

marissa [1.9K]

The energy transferred to the spring is given by:
$U= \frac{1}{2}kx^2$
where
k is the spring constant
x is the elongation of the spring with respect its initial length

Let's convert the data into the SI units:
$k=52.9 N/cm = 5290 N/m$
$x=40.0 cm=0.4 m$

so now we can use these data inside the equation ,to find the energy transferred to the spring:
$U= \frac{1}{2}kx^2= \frac{1}{2}(5290 N/m)(0.4m)^2=423.2 J$

4 0

3 years ago