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mrs_skeptik [129]

3 years ago

6

During a demonstration of the gravitational force on falling objects to her class, Sarah drops an 11 lb. bowling ball from the t

op of the science building. Determine distance the ball has traveled after falling for 1.0 second, ignoring air resistance and given the gravitational acceleration of 9.8 m/sec2.
A) 4.9 m
B) 11 m
C) 20 m
D) 32 m

The center on a high school basketball team wants to increase the maximum height of his jump. What statement correctly describes how he could achieve this goal?
A) Wearing lighter shoes would increase the height of his jump.
B) Jumping at a 45° angle would increase the height of his jump.
C) Jumping with greater acceleration would increase the height of his jump.
D) Jumping with greater initial velocity would increase the height of his jump

2 answers:

asambeis [7]3 years ago

7 0

1.

Answer: option A) 4.9 m

Explanation:

From the equation of motion,

s = u t + 0.5 a t ²

Where, t is the time, a is the acceleration, u is the initial velocity and s is the displacement.

Here, the initial velocity of the bowling ball is zero. u = 0

The ball falls under gravity. Thus, a = g = 9.8 m/s²

Time = 1.0 s

Hence, s = 0 + 0.5 × 9.8 m/s² × (1.0 s)² = 4.9 m

Thus, the ball has traveled 4.9 m after falling for 1.0 second. Correct option is A.

2.

Answer: option D) Jumping with greater initial velocity would increase the height of his jump

Explanation:

The maximum height achieved by a jumper depends on the angle , the initial velocity and acceleration due to gravity.

For maximum height, angle of the jump should be 90 degrees. Hence, more the initial velocity more the height of the jump.

Thus, correct option is D.

tia_tia [17]3 years ago

5 0

1.A) 4.9 m

AL2006 Ace

The instant it was dropped, the ball had zero speed.

After falling for 1 second, its speed was 9.8 m/s straight down (gravity).

Its AVERAGE speed for that 1 second was (1/2) (0 + 9.8) = 4.9 m/s.

Falling for 1 second at an average speed of 4.9 m/s, is covered 4.9 meters.

ANYTHING you drop does that, if air resistance doesn't hold it back.

Read more on Brainly.com - brainly.com/question/11776597#readmore

2 idk sorry

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Ede4ka [16]

Answer:

An apple, potato, and onion all taste the same if you eat them with your nose plugged

Explanation:

3 0

3 years ago

Three metal fishing weights, each with a mass of 1.00x102 g and at a temperature of 100.0°C, are placed in 1.00x102 g of water a

worty [1.4K]

Answer:

Approximately $0.253\; {\rm J \cdot g^{-1} \cdot K^{-1}}$ assuming no heat exchange between the mixture and the surroundings.

Explanation:

Consider an object of specific heat capacity $c$ and mass $m$ . Increasing the temperature of this object by $\Delta T$ would require $Q = c\, m \, \Delta T$ .

Look up the specific heat of water: $c(\text{water}) = 4.182\; {\rm J \cdot g^{-1} \cdot K^{-1}}$ .

It is given that the mass of the water in this mixture is $m(\text{water}) = 1.00 \times 10^{2}\; {\rm g}$ .

Temperature change of the water: $\Delta T(\text{water}) = (45 - 35)\; {\rm K} = 10\; {\rm K}$ .

Thus, the water in this mixture would have absorbed :

$\begin{aligned}Q &= c\, m\, \Delta T \\ &= 4.182\; {\rm J \cdot g^{-1}\cdot K^{-1}} \\ &\quad \times 1.00 \times 10^{2}\; {\rm g} \times 10\; {\rm K} \\ &= 4.182 \times 10^{3}\; {\rm J}\end{aligned}$ .

Thus, the energy that water absorbed was: $Q(\text{water}) = 4.182 \times 10^{3}\; {\rm J}$ .

Assuming that there was no heat exchange between the mixture and its surroundings. The energy that the water in this mixture absorbed, $Q(\text{water})$ , would be the opposite of the energy that the metal in this mixture released.

Thus: $Q(\text{metal}) = -Q(\text{water}) = -4.182 \times 10^{3}\; {\rm J}$ (negative because the metal in this mixture released energy rather than absorbing energy.)

Mass of the metal in this mixture: $m(\text{metal}) = 3 \times 1.00 \times 10^{2}\; {\rm g} = 3.00 \times 10^{2}\; {\rm g}$ .

Temperature change of the metal in this mixture: $\Delta T(\text{metal}) = (100 - 45)\; {\rm K} = 55\; {\rm K}$ .

Rearrange the equation $Q = c\, m \, \Delta T$ to obtain an expression for the specific heat capacity: $c = Q / (m\, \Delta T)$ . The (average) specific heat capacity of the metal pieces in this mixture would be:

$\begin{aligned}c &= \frac{Q}{m\, \Delta T} \\ &= \frac{-4.182 \times 10^{3}\; {\rm J}}{3.00 \times 10^{2}\; {\rm g} \times (-55\; {\rm K})} \\ &\approx 0.253\; {\rm J \cdot g^{-1} \cdot K^{-1}}\end{aligned}$ .

6 0

2 years ago

pysical property is defined as a blank that can be observed blank changing the matter into another type of blank

Molodets [167]

Physical property is defined as a property that can be observed without changing the matter into another type of matter.

<h3>What are physical properties of matter?</h3>

Physical properties of matter are those properties which can be easily observed without a change in the composition of the substance,

Some physical properties of matter include:

Volume
Shape
Density
Taste
Color
Mass
Electrical conductivity

In conclusion, physical properties do not change the composition of matter and can easily be observed.

Learn more about physical properties at: brainly.com/question/12330204

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2 years ago

Which example most effectively illustrates the dual nature of light?

AveGali [126]

The answer is A. Cameras that use photographic film.
Light has both properties of a wave and a particle.<span>Light can be treated like a wave, but its energy is distributed in discrete packets called </span>photons. Light can appear in different wavelength -- the greater the wavelength, the lesser energy it emits. This explains the existence of color! A <span>chemical change occurs in the photographic detectors that are coated on the film when the energy in the photon of light hits the film. This process is called photochemistry. </span>

4 0

3 years ago

Read 2 more answers

A waterfall is an example of what energy conversion?

Umnica [9.8K]

Answer:

most common energy transformations is the transformation between potential energy and kinetic energy. In waterfalls such as Niagara Falls, potential energy is transformed to kinetic energy. The water at the top of the falls has gravitational potential energy. As the water plunges, its velocity increases.

Explanation:

Hope this helps you

( I got this from transformation and conservation article)

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3 years ago