A simple pendulum makes 540 complete oscillations in a minute, so its frequency is ........... HZ

A meter is an Sl unit. Which quantity might you measure in meters?

Tasya [4]

Explanation:

Temperature is Kelvin, Mass is Kilograms, Length is Meters and Electric current is Ampere.

Hence the answer is C.

4 0

4 years ago

4. A stone is dropped from the fifth floor of a building from a height 14 m. How long would it take

aleksklad [387]

Answer:

1.690308509s

Explanation:

v²=u²+2as

v²=0²+2(9.8)(14)

v²=274.4

∴v=16.56502339m/s

v=u+at

16.56502339=0+9.8t

∴t=1.690308509s

6 0

3 years ago

The sound source of a ship’s sonar system operates at a frequency of 22.0 kHz . The speed of sound in water (assumed to be at a

Dafna1 [17]

Answer:

$\Delta f=f_{Lr}-f_{Se}$

147.45 Hz

Explanation:

v = Speed of sound in water = 1482 m/s

$v_w$ = Speed of whale = 4.95 m/s

Frequency of the wave in stationary condition

$f_{Lr}=f\dfrac{v+v_w}{v-v_w}$

Ship's frequency which is reflected back

$f_{Se}=f\dfrac{v}{v-v_w}$

The difference in frequency is given by

$\Delta f=f\dfrac{v+v_w}{v-v_w}-f\dfrac{v}{v-v_w}\\\Rightarrow \Delta f=f_{Lr}-f_{Se}$

$\mathbf{\Delta f=f_{Lr}-f_{Se}}$

$f_{Lr}=22\times \dfrac{1482+4.95}{1482-4.95}\\\Rightarrow f_{Lr}=22.14745\ kHz$

$f_{Se}=22\ kHz$

$\Delta f=f_{Lr}-f_{Se}\\\Rightarrow \Delta f=22.14745-22\\\Rightarrow \Delta f=0.14745\ kHz\\\Rightarrow \Delta f=147.45\ Hz$

The difference in wavelength is 147.45 Hz

7 0

3 years ago

Match the scenario with the justification Please help ;-; 1. Gage is beginning a low calorie diet, so he eats three servings of

AfilCa [17]

Answer:

1. "Gage is beginning a low calorie diet, so he eats three servings of chicken for lunch" is equal to C: "Protein contains four calories per gram of fat, so it is a low fat, high energy food."

2. "Walter eats two servings of whole grain pasta the night before running a 5K" is equal to B: "Carbohydrates contain four calories per gram of fat, so they need to come from grains in moderation."

3. "Maggie eats half a candy bar and saves the rest for the next day" is equal to A: "Fatty foods contain nine grams of pure fat and have little nutritional value."

Explanation:

Chicken is a popular, low-fat food that provides an impressive amount of high-quality protein in just one serving. The breast is the leanest part of a chicken. A 3-ounce (85-grams) serving of roasted, skinless chicken breast contains only 3 grams of fat but provides 26 grams of protein (47).

Pasta is a fat-free, low sodium food that can fit right in with a weight loss or management plan. One cup of cooked pasta contains just 200 calories, in addition to valuable vitamins and minerals.

Sweets like candy, soft drinks, syrups, jams, and jellies are made mostly of sugars. Most of these foods do not contain many vitamins or minerals. So they are called "empty calorie" foods. Fats, oils and sweets are not bad foods.

4 0

3 years ago

The cuboid and the cube below are placed on the floor. The cuboid has a weight of 60N and the cube has a weight of 40N. Which ex

Anika [276]

Hello. You forgot to put the image that shows information needed to answer that question. The image is attached below:

Answer:

The cuboid and the cube exert the same pressure on the floor.

Explanation:

To answer this question, we must first consider that the area of the cuboid is equal to 24cm^2, while the area of the cube is equal to 16cm^2.

With that, we must calculate the pressure that each exerts, with the formula:

P = F / A

Cuboid: P = 60 / 0.0024 = 25000 N/m^2

Cube: P = 40 / 0.0016 = 25000 N/m^2

7 0

4 years ago

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