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3 years ago

A sprinter accelerates from rest to 10.0 m/s in 1.35 s l. What is her acceleration?

Physics

1 answer:

ale4655 [162]3 years ago

8 0

Answer:

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Explanation:

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An FM radio station transmits a signal with a frequency of 89.1 MHz. Give the wavelength in meters. (use at least three signific

STALIN [3.7K]

Answer:

Explanation:

89.1 MHz means

89.1×10^6 cycles/second.

Electromagnetic radiation (including radio waves) travel at

3.0×10^8meters/second

Wavelength = Speed/Frequency

The wavelength of a

89.1MHz radio signal is

3.0×10^8/89.1x10^6

= 0.03x10^2

= 3meters

7 0

3 years ago

The current atmospheres of the terrestrial planets were formed when the planets formed

Alexus [3.1K]

A secondary atmosphere is an atmosphere of a planet that did not form by accretion during the formation of the planet's star. A secondary atmosphere instead forms from internal volcanic activity, or by accumulation of material from comet impacts. It is characteristic of terrestrial planets, which includes the other terrestrial planets in the Solar System: Mercury, Venus, and Mars. Secondary atmospheres are relatively thin compared to primary atmospheres like Jupiter's. Further processing of a secondary atmosphere, for example by the processes of biological life, can produce a tertiary atmosphere, such as that of Earth.

6 0

3 years ago

All matter on earth contains energy

exis [7]

This is true since all matter contains some form of energy even just moving electrons and friction count as energy

8 0

3 years ago

Read 2 more answers

A parallel circuit has two 8.0-ohm resistors and a power source of 9.0 volts. If a 12.5-ohm resistor is added to the circuit in

natta225 [31]

The initial equivalent resistance of the circuit is
$\frac{1}{R_{eq}}= \frac{1}{R_1}+ \frac{1}{R_2}= \frac{1}{8 \Omega}+ \frac{1}{8 \Omega} = \frac{1}{4 \Omega}$
which means
$R_{eq}= 4 \Omega$
Therefore the initial current in the circuit is
$I= \frac{V}{R}= \frac{9 V}{4 \Omega}=2.25 A$

When the new resistor of $12.5 \Omega$ is added to the circuit in parallel, the new equivalent resistance of the circuit is
$\frac{1}{R_{eq}} = \frac{1}{8 \Omega} + \frac{1}{8 \Omega}+ \frac{1}{12.5 \Omega}= 0.33 \Omega^{-1}$
from which we find
$R_{eq}=3 \Omega$
This means that the equivalent resistance of the circuit has decreased, and the new current is
$I= \frac{V}{R_{eq}}= \frac{9 V}{3 \Omega}=3 A$
which means that the current in the circuit has increased.

4 0

3 years ago

Read 2 more answers

A spin balancer rotates the wheel of a car at 480 revolutions per minute. if the diameter of the wheel is 26 inches, what road s

Mariana [72]

Part A:
To answer this item, we need to convert the given revolutions per minute in speed expressed as miles per hour. In order to do so, we need to use the dimensional analysis and the appropriate conversion factor.

We calculate the circumference that is covered by the wheel.
C = πD
where C is the circumference and D is the diameter.

Substitute the known values,
C = π(26 in) = 81.68 inches

The speed tested is calculated below.
s = (81.68 inches/rev)(480 rev/min)(1 mil/63360 inches)(60 min/1 hr)
s = 37.127 mil/h

ANSWER: 37.127 mil/h

Part B:
Similar to what was done in Part A, the setting of the balancer is calculated below,
setting = (80 mil/h)(1h/60 min)(63360 in/1 mil)(1 rev/81.68 in)
setting = 1034.23 rev/min

ANSWER: 1034.23 rev/min

3 0

3 years ago