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bekas [8.4K]
3 years ago
13

Frequency is measured in units called?

Physics
1 answer:
irina1246 [14]3 years ago
5 0
The frequency, f, of a wave is the number of waves passing a point in a certain time. We normally use a time of one second, so this gives frequency the unit hertz (Hz), since one hertz is equal to one wave per second.
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You and your housemate have an argument over the cost of the electric bill. You want to turn off the outside porch light before
deff fn [24]

Answer:

  Cost = $ 3,995

Explanation:

Let's start by looking for the energy consumed, which is the power over time

               E = P t

The power is 65 W, the time is 12 h each day, in a period of 30 days the time is

            t = 12  30 = 360 h

            E = 65 360

            E = 23,500 W h

We reduce to KW h

            1 kW = 1000 W

            E = 23.5 kW h

Let's use a direct ratio rule (rule of three) to find the cost

           Cost = 23.5  17.0

           Cost = 399.5 c

           Cost = $ 3,995

5 0
3 years ago
An alumium rod when measured with a steel scale both being at 25 degree celcius appears to be 1 meter long. If the scale is corr
natulia [17]
Given:
temperature at which the rod is measured= 25°
length of aluminium rod measured at 25°C= 1 meter
temperature at which the scale is correct= 0°C
Linear expansivity of steel= 12* 10^-6
linear expansivity of aluminum= 26* 10^-6
To find:
True length of rod at 25°C
Length of rod at 0°C
Solution:
Let the length of the aluminum and steel rod at 0°C be L0A and L0S respectively.
Length of the steel scale at 25°C , thermal expansion is:
LA25 = LA0(1+ (αS - αA)25)
LA0 = LA25/ (1+ (αS-αA)t)
LA0 = 100/ (1+ (12*10^-6 - 26*10^-6)25)
LA0 ≈ 100.05 cm at 0°C
2. Let the length at 25°C of the aluminium trod be LA25
The actual measure of aluminum rod at 25°C, will be
LA25 = 100 * (1+ 26* 10^-6*25)
LA25 ≈ 100.06 cm
5 0
3 years ago
Read 2 more answers
Find the kinetic energy of a 0.1-kilogram toy truck moving at the speed of 1.1 meters per second.
Viktor [21]

Answer:

0.061 J

Explanation:

The kinetic energy of an object is given by

K=\frac{1}{2}mv^2

where

m is the mass of the object

v is its speed

For the toy truck in the problem, we have

m = 0.1 kg is its mass

v = 1.1 m/s is its speed

Putting the numbers into the equation, we find

K=\frac{1}{2}(0.1 kg)(1.1 m/s)^2=0.061 J

6 0
3 years ago
You are assigned the design of a cylindrical, pressurized water tank for a future colony on Mars, where the acceleration due to
scoundrel [369]

Answer:

488.6KN

Explanation:

Hello!

the first step to solve this problem we must find the pressure exerted at the bottom of the tank (P) which is the sum of the external air pressure (P1 = 92kPa), the pressure inside the tank (P2 = 100kPa) and the pressure due to the weight of the water (P3), taking into account the above we have the following equation

P=P1+P2+P3

to find the pressure at the bottom of the tank due to the weight of the water we use the following equation

P3=\alpha gh

where

α=density=1  g/cm^3=1000kg/M^3

H=height=14.1m

g=gravity=3.71m/s^2

solving

P3=(1000)(14.1)(3.71)=52311Pa=52.3kPa

P=P1+P2+P3

P=100kPa+92kPa+52.3kPa=244.3kPa

finally to solve the problem we remember that the pressure is the force exerted on the area

P=\frac{F}{A} \\F=PA\\F=(244.3kPa)(2m^2)=488.6KN

3 0
3 years ago
PLS PLS PLS PLS PLS HELP
stepladder [879]

Answer:

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.

Electromagnets

When an electric current flows in a wire, it creates a magnetic field around the wire. This effect can be used to make an electromagnet. A simple electromagnet comprises a length of wire turned into a coil and connected to a battery or power supply.

5 0
3 years ago
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