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xxTIMURxx [149]
4 years ago
6

Which of the following is a FALSE statement about acceleration? A. Acceleration can be zero, positive, or negative. B. An object

can have acceleration with zero velocity. C. An object can have acceleration with negative velocity. D. Acceleration is always in the same direction as velocity.
Physics
1 answer:
olchik [2.2K]4 years ago
6 0
<h3><u>Answer</u>;</h3>

C. An object can have acceleration with negative velocity.

<h3><u>Explanation</u>;</h3>
  • Acceleration is a measure of the change in velocity over time. The change in velocity is measured in meter per second (m/s), and time interval is measured in second (s).
  • Therefore, acceleration measures the change in meters per second every second [(m/s)/s], namely meters per second per second or meters per second squared (m/s2).
  • If an object has zero acceleration, its velocity doesn’t have to be zero. Acceleration is a measure of the change in velocity over time. Zero acceleration means there is no change in velocity over time, namely constant velocity.
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What nuclear reaction is the energy source of a white dwarf?
sammy [17]

Answer:

Multiple choice answer would be "None"

Explanation:

White dwarfs are radiating stored heat from earlier reactions.  

Technically, it would be the last fusion stage the star went through  

BEFORE it became a white dwarf, but that's nit-picking.

7 0
4 years ago
What is the approximate weight of the air inside the tire in English Engineering Units (tire outside diameter = 49", rim diamete
Mademuasel [1]

Answer:

1.265 Pounds

Explanation:

Data provided:

Tire outside diameter = 49"

Rim diameter = 22"

Tire width = 19"

Now,

1" = 0.0254 m

thus,

Tire outside radius, r₁ = 49"/2 = 24.5" = 24.5 × 0.0254 = 0.6223 m

Rim radius, r₂   = 22" / 2 = 11" = 0.2794 m

Tire width, d = 19" = 0.4826 m

Now,

Volume of the tire = π ( r₁² - r₂² ) × d

on substituting the values, we get

Volume of air in the tire = π (  0.6223² - 0.2794² ) × 0.4826 = 0.46877 m³

Also,

Density of air = 1.225 kg/m³

thus,

weight of the air in the tire = Density of air × Volume air in the tire

or

weight of the air in the tire = 1.225 × 0.46877 = 0.5742 kg

also,

1 kg = 2.204 pounds

Hence,

0.5742 kg = 0.5742 × 2.204  = 1.265 Pounds

3 0
3 years ago
to lift a load to roof, you apply 21 n of force to a pulley. the pulley applies 21 n of force to the load. what is the mechanica
MariettaO [177]

Answer:

The mechanical advantage of the pulley is 1.

Explanation:

The mechanical advantage of the pulley is given as

MA=\frac{F}{f}

Here, MA is represent for the mechanical advantage of the pulley, F is load for lift and f applied force.

Given F =21 N and f= 21 N.

Substitute the given values, we get

MA=\frac{21N}{21N}

MA = 1.

Thus, the mechanical advantage of the pulley is 1.

7 0
4 years ago
Sorry if it’s blurry. Please help. I can’t mess up.
geniusboy [140]

answer:

MAXIMUM SPEED

explanation:

IM SURE THAT IS THE ANSWER

6 0
3 years ago
Josh is much bigger than taylor. after the push, which of the two is moving faster?
egoroff_w [7]
If E = 1/2 * m * v^2
v = (2E/m)^1/2
so the larger the mass, the higher the velocity hence taylor is moving faster
6 0
3 years ago
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