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3 years ago

When a moving object reduces its speed, what happens to the objects acceleration in relation to its velocity?

1 answer:

7 0

-- When the object's acceleration is in the same direction
as its velocity, the object's speed increases.

-- When the object's acceleration is in the direction opposite to
its velocity, the object's speed decreases.

-- When the object's acceleration is in the direction perpendicular
to its velocity, its speed doesn't change, but its direction does.

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People with good hearing can perceive sounds as low in level as −7.53 dB at a frequency of 3000 Hz. What is the intensity of thi

lora16 [44]

Answer:

attached below

Explanation:

3 0

4 years ago

After each charging, a battery is able to hold only 99% of the charge from the previous charging. The battery was used for 5 hou

Aloiza [94]

Answer:

500 hours

Explanation:

The sum of total hours over its lifetime will be given by

$T=\frac {T_o}{1-r}$

Where T is total time, r is rate in decimal and To is the original charge hours. Substituting the original charge hours with 5 hours and rate as 0.99 then the time will be

$T=\frac {5\ hours}{1-0.88}=500\ hours$

Therefore, the time is equivalent to 500 hours

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3 years ago

How long would it take you too run the 100m sprint if from rest you accelerate at 2m/s/s for the whole race?

fredd [130]

Answer:

10 s

Explanation:

Given:

Δx = 100 m

v₀ = 0 m/s

a = 2 m/s²

Find: t

Δx = v₀ t + ½ at²

100 m = (0 m/s) t + ½ (2 m/s²) t²

t = 10 s

4 0

3 years ago

A 20-pound object is dropped from a 50-foot bridge onto the ground below it. A 50-pound object is dropped from a 100-foot cliff

Anvisha [2.4K]

Answer:

here 20 lb object will hit the ground first

Explanation:

Acceleration of the object while it is dropped in air is given as

$F = mg$

$a = \frac{F}{m}$

$a = g$

so acceleration of the object is independent of the mass of the object

now time to reach the ground is given as

$h = \frac{1}{2}gt^2$

$t = \sqrt{\frac{2h}{g}}$

for 20 pound object

$t_1 = \sqrt{\frac{2(50)}{32}}$

$t_1 = 1.77 s$

for 50 pound object

$t_2 = \sqrt{\frac{2(100)}{32}}$

$t_2 = 2.5 s$

5 0

3 years ago

Which of the following properties did Rutherford use in his experiment?

Ronch [10]

<u>Answer</u>:

(C) The positive charge of the alpha particles and the negative charge of the electrons are the properties Rutherford used in his experiment

<u>Explanation</u>:

In his scattering experiment, scientist Ernest Rutherford used the property of positively charged alpha particles and negatively charge electrons. He performed this experiment by passing some of the alpha particles through a gold foil. The result was that the some alpha particles scattered while some passed through the gold foil without collision.

He concluded that the alpha particles are centrally positively charged and needed a large amount repelling force. This experiment of Rutherford is also known as Rutherford model of atom. This experiment helped him in doing so many other discoveries.

3 0

4 years ago