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4 years ago

Each of the following elements is magnetic except

Physics

2 answers:

maxonik [38]4 years ago

3 0

Answer:

A is the answer because it will not stick

Kamila [148]4 years ago

3 0

Answer: aluminum

Explanation:

but some types of aluminum sticks

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What happened to the sedimentary rock layers that first formed over the ancient rock

Gwar [14]

The surface of the rock eroded

3 0

3 years ago

A television remote control uses infrared light with a wavelength of 940 nm. What is the frequency of the light?

Ronch [10]

Answer:

Frequency = 3.19 * 10^14 Hz or 1/s

Explanation:

Relationship b/w frequency and wavelength can be expressed as:

C = wavelength * frequency, where c is speed of light in vacuum which is 3.0*10^8 m/s.

Now simply input value (but before that convert wavelength into meters to match the units, you do this by multiply it by 10^-9 so it will be 940*10^-9)

3.0 * 10^8 = Frequency * 940 x 10^-9

Frequency = 3.19 * 10^14 Hz or 1/s

5 0

3 years ago

a wave travels at a speed of 793 m/s and has a wavelength of 2.3 meters. calculate the frequency of the wave

Savatey [412]

Answer:

344.8 Hz

Explanation:

The frequency of a wave is given by:

$f=\frac{v}{\lambda}$

where

v is the speed of the wave

$\lambda$ is its wavelength

Here we have

v = 793 m/s

$\lambda=2.3 m$

Substituting into the equation, we find

$f=\frac{793 m/s}{2.3 m}=344.8 Hz$

4 0

3 years ago

Can you explain how to solve each pleade

Kryger [21]

Answer:

Explanation:

The resistance column is correct.

I1 = I2 = I3 = I4 = 2 Amps

So all the currents are the same.

R = 110

I = 2 amps

V = ?

Vt = I * R

Vt = 2 * 110

Vt = 220

=============

V1 = 20 * 2 = 40 volts. That's 40 volts dropped from the right side of R1 to the left side.

V2 = 60 * 2 = 120 volts across the 60 ohm resistor

V3 = 30 * 2 = 60

Total voltage = 40 + 120 + 60

Total voltage = 220 which is just what it should be.

==========================

Power

P1 = V1 * I

P1 = 40 * 2

P1 = 80 watts

P2 = 120*2

P2 = 240

P3 = 60 * 2

P3 = 120

Total Power = 80 + 240 + 120

Total Power = 440

7 0

3 years ago

Cyclist A is moving at 20.0 m/s whereas cyclist B is moving at 12.0 m/s in the same direction and is initially ahead ofA. When t

stealth61 [152]

Answer:

$v_{fA} = 28 \frac{m}{s}$

Explanation:

The kinematic parameters from the moment the two cyclists begin to accelerate until they meet are:

Initial parameters:

$v_{oA} = 20 m/s$ : Initial speed of cyclist A

$v_{oB} = 12 m/s$ : Initial speed of cyclist B

Final parameters:

$v_{fB} = 20 m/s$ : Final speed of cyclist B

$d_{A} = d_{B}$

distance of cyclist A = distance of cyclist B

$t_{A} =t_{B} = 12s$

time of cyclist A = time of cyclist B

Cyclist B Kinematics

$v_{fB} = v_{oB} +a_{B} *t\\$

$36= 12 + a_{B} *12$

$a_{B} = \frac{36-12}{12}$

$a_{B} = 2 \frac{m}{s^{2} }$

$d_{B} =( v_{oB})*( t)+( \frac{1}{2} )*(a_{B})* (t)^{2}$

$d_{B} =( 12*(12)+( \frac{1}{2} )*(2)* (144)}$

$d_{B} = 288m$

Cyclist A Kinematics

$d_{A} =( v_{oA})*( t)+( \frac{1}{2} )*(a_{A})* (t)^{2}$

$d_{A} =(20*( 12)+( \frac{1}{2} )*(a_{A})* 144}$

$d_{A} = 240 + 72*(a_{A})$

$288=240+72*(a_{A} )$

$a_{A} = \frac{288-240}{72}$

$a_{A} = 0.67 \frac{m}{s^{2} }$

$v_{fA} = v_{oA} + a_{A} * t$

$v_{fA} = 20 + 0.67*12$

$v_{fA} = 28 \frac{m}{s}$

7 0

3 years ago