Draw an arrow to represent the friction force.

Answer:

10 m/s

Explanation:

Speed = wavelength * frequency

       =   5 m   *  2 / s   = 10 m/s

The volume of a rock with a density of 45 g/mL and a mass of 855g is 19mL.

The volume of a gas can be calculated by dividing the mass of the substance by its density as follows:

Volume = mass ÷ density

According to this question, a rock has a density of 45 g/mL and a mass of 855g. The volume can be calculated as follows:

Volume = 855g ÷ 45g/mL

Volume = 19mL

Therefore, the volume of a rock with a density of 45 g/mL and a mass of 855g is 19mL.

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The speed of the river current with respect to the boat is(Vₙ)=  1.036 m/s.

Speed is a scalar quantity. Speed is a way of measuring how quickly something is moving or being done, or something moving fast.

To calculate the values of the speed of the river, we are using the formula,

v=1.768-Vₙ

The given parameters;

boat's speed ,  vₐ= 2.5 m/s

the river's width, w = 285 m

upstream distance , d = 118 m

the pilot's direction, θ = 45⁰

We know the velocity has the vertical and horizontal component, so we can calculate this ;

v(x)=vₐsinθ=2.5*sin45°=1.768m/s

v(y)=vₐcosθ=2.5*cos45°=1.768m/s

To calculate the time taken for the boat is  ;

t=w/v(y)

Or, t=285/1.768

Or, t = 161.25 s

To calculate the total horizontal velocity of the boat and the river; we are using the formula,

v=1.768-Vₙ

Or,1.768-Vₙ=d/t

Or, 1.768-Vₙ=118/161.2

Or, 1.768-Vₙ=0.732

Or, Vₙ=1.036m/s

From the above calculation we can conclude that,

The speed of the river current with respect to the boat is 1.036 m/s.

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Note: The question is incomplete in the portal. Here is the total question,

Question: A boat, whose speed in still water is 2.50 m/s, must cross a 285-m wide river and arrive at a point 118m upstream from where it starts. To do so, the pilot must head the boat at a 45.0 degrees upstream angle. What is the speed of the rivers current?

The direction of the given vector B of 18.6 m that is 80° left of the positive y-axis is 170°

Angle of the vector made with positive y-axis = 80°

Angle between positive x and y axis = 90°

Direction of B, θ = 90° + 80°

θ = 170°

Direction of a vector is the angle of the vector that is made with positive x-axis. A vector with a certain direction of certain degrees means that the vector is rotated that much degrees in counter-clockwise direction relative to positive x-axis.

Therefore, the direction of the vector B is 170°

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A. The distance travelled after 53.3 seconds is 1919.63 m

B. The velocity of the runner ath the given time is 64.53 m/s

The distance travelled can be obtained as follow:

s = ut + ½at²

s = (7.5 × 53.3) + (½ × 1.07 × 53.3²)

s = 399.75 + (0.535 × 2840.98)

s = 399.75 + 1519.87615

s = 1919.63 m

Thus, the distance travelled in 53.3 seconds is 1919.63 m

v = u + at

v = 7.5 + (1.07 × 53.3)

v = 7.5 + 57.031

v = 64.53 m/s

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A free body diagram of the box consists of weight of the box (50N) acting downwards, normal reaction acting upwards and applied force acting in x-direction.

A free-body diagram is a sketch of an object of interest with all the surrounding objects stripped away and all of the forces acting on the body shown.

The forces on the box;

The free body diagram of the forces acting on the box is illustrated as follows;

                                ↑ R

                      F    → Ф

                                ↓ W

Thus, a free body diagram of the box consists of weight of the box (50N) acting downwards, normal reaction acting upwards and applied force acting in x-direction.

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Answer:

They are attracted to each other. Maybe a magnet. Like 99% sure.

Explanation:

Objects that are usually attracted to each other are magnets. When you release two magnets close to each other, with each pole opposite to the other, they move toward each other and stick. You can only take them apart by force.

The maximum number of chips is 33,333

What is a chip?

A chip is a tiny but complex modules that store computer memory or provide logic circuitry for microprocessors.

We need to find the number of wafers that can be cut from a single crystal.

The crystal is 25cm and each wafer is 0.3mm. We perform division to get the number of wafers per crystal after getting everything into the same units. 25cm=250mm.

250mm/0.3mm=833.3333 wafers.

Each wafer yields 400 chips so we multiply 400 chips per wafer by 833.33 wafers to get 33,333 chips.

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Explanation:

These "more energetic particles" may have

sufficient energy to escape from the surface

of the liquid as gas or vapour.... Evaporation

takes place at room temperature which is

often well below the boiling point of the

liquid. Evaporation happens from the surface

of the liquid.

Heat transfer by radiation and convection causes the surface water of the pool to be warm which decreases with depth.

There are two heat transfer process responsible for variation in temperature of water at different depth of a pool, they include;

The surface of the water absorbs heat from the air and the sun. The heat from the sun is transferred to the pool through radiation.

The heat from the air is transferred to the pool through convection.

Thus, these two heat transfer processes  causes the surface water of the pool to be warm which decreases with depth.

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