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3 years ago

PLease help i will give brainliest

Physics

1 answer:

musickatia [10]3 years ago

8 0

Answer:

1. False

2. Fats

3. False

Explanation:

MyPlate is an initiative from the United States Department of Agriculture that is designed to help Americans improve their eating habits throughout their lifetimes. Every meal matters. The five food groups represented in My Plate include vegetables, grain, dairy, protein foods, and fruits.

Calories are a source of energy for the human body. So, the more active a person is, the more energy he would need to be supplied to him in form of calories. The less active a person is, the fewer calories he would need.

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A 0.5-kg ball moving at 5 m/s strikes a wall and rebounds in the opposite direction with a speed of 2 m/s. If the impulse occurs

mart [117]

Given that:

mass of the ball (m) = 0.5 Kg ,

ball strikes the wall (v₁) = 5 m/s ,

rebounds in opposite direction (v₂) = 2 m/s,

time duration (t) = 0.01 s,

Determine the force (F) = ?

We know that from Newton's II law,

F = m. a Newtons

(velocity acting in opposite direction, so a = ( (v₁ + v₂)/t

= m × (v₁ + v₂)/t

= 0.5 × (5 + 2)/0.01

= 350 N

The force acting up on the ball is 350 N

6 0

3 years ago

What is the relationship between Avogadro's number and a mole?

Shtirlitz [24]

Answer:

A. There are 6.02 x 1023 items in a mole, which equals Avogadro's

number

Explanation:

The mole of a substance is

8 0

2 years ago

A barge ﬂoating in fresh water (p = 1000 kg/m3) is shaped like a hollow rectangular prism with base area A = 550 m2 and height H

Karolina [17]

Answer:

a) $\Delta m = 330000\,kg$ , b) $h = 1.268\,m$

Explanation:

a) According the Archimedes' Principle, the buoyancy force is equal to the displaced weight of surrounding liquid. The mass of the coal in the barge is:

$\Delta m \cdot g = \rho_{w}\cdot g \cdot \Delta V$

$\Delta m = \rho_{w}\cdot \Delta V$

$\Delta m = \left(1000\,\frac{kg}{m^{3}} \right)\cdot (550\,m^{2})\cdot (1.05\,m-0.45\,m)$

$\Delta m = 330000\,kg$

b) The submersion height is found by using the equation derived previously:

$\Delta m = \rho_{w}\cdot \Delta V$

$450000\,kg = \left(1000\,\frac{kg}{m^{3}}\right)\cdot (550\,m^{2})\cdot (h-0.45\,m)$

The final submersion height is:

$h = 1.268\,m$

4 0

3 years ago

Read 2 more answers

A ball has a mass of 4.65 kg and approximates a ping pong ball of mass 0.060 kg that is at rest by striking it in an elastic col

castortr0y [4]

Answer:

the final velocity of the ball is 4.87 m/s

the final velocity of the ping ball is 9.87 m/s

Explanation:

Given;

mass of the ball, m₁ = 4.65 kg

mass of the ping ball, m₂ = 0.06 kg

initial velocity of the ping ball, u₂ = 0

initial velocity of the ball, u₁ = 5 m/s

let the final velocity of the ball = v₁

let the final velocity of the ping ball, = v₂

Apply the principle of conservation of linear momentum for elastic collision;

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

4.65(5) + 0.06(0) = 4.65v₁ + 0.06v₂

23.25 + 0 = 4.65v₁ + 0.06v₂

23.25 = 4.65v₁ + 0.06v₂ ------ (1)

Apply one-directional velocity equation;

u₁ + v₁ = u₂ + v₂

5 + v₁ = 0 + v₂

5 + v₁ = v₂

v₁ = v₂ - 5 -------- (2)

substitute equation (2) into (1)

23.25 = 4.65(v₂ - 5) + 0.06v₂

23.25 = 4.65v₂ - 23.25 + 0.06v₂

46.5 = 4.71 v₂

v₂ = 46.5/4.71

v₂ = 9.87 m/s

v₁ = v₂ - 5

v₁ = 9.87 - 5

v₁ = 4.87 m/s

5 0

3 years ago

What do you think happens to the length of time it takes the planets to orbit the sun as they get further away? Explain your ans

gogolik [260]

Answer:Error Analysis A store is instructed by corporate headquarters to put a markup of 11% on all items. An item costing $27 is displayed by the store manager at a selling price of $3. As an employee, you notice that this selling price is incorrect. Find the correct selling price. What was the manager's likely error?

The correct selling price is $

nothing. (Round to the nearest dollar as needed.)

What was the manager's likely error?

The manager set the selling price at the markup.

The manager subtracted the markup from the cost instead of adding it.

The manager added the markup to the cost instead of subtracting it.

The manager set the selling price at the cost.

Click to select your answer(s).

Explanation:

7 0

2 years ago

Read 2 more answers