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3 years ago

A bicyclist travels 60.0 in 3.5 hours. what is the cyclists average speed

2 answers:

5 0

60 miles in 3.5 hours. we need to divide to find how many miles he went in one hour.

so 60 divided by 3.5 is 17.1428571429

If you round he was going about 17 miles an hour

liubo4ka [24]3 years ago

3 0

Average speed = (distance)/(time to cover it). ..... (60)/(3.5 hours) = 17.143 per hour. ... (The 17.143 could be nanometers, inches, miles, light years etc. No unit is given in the question.)

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You are trying to determine the specific gravity of a solid object that floats in water. If m is the mass of your object, mS is

Alisiya [41]

Answer:

Specific Gravity = m/[m(s)-m(os)]

Explanation:

Specific gravity, also called relative density, is the ratio of the density of a substance to the density of a reference substance. By this definition we need to find out the ratio of density of the object of mass m to the density of the surrounding liquid.

m = mass of the object

Weight in air

W (air) = mg, where g is the gravitational acceleration

Weight with submerged with only one mass

m(s)g + Fb = mg + m(b)g, consider this to be equation 1

where Fb is the buoyancy force

Weight with submerged with both masses

m(os)g + Fb’ = mg + m(b)g, consider this to be equation 2

equation 1 – equation 2 would give us

m(s)g – m(os)g = Fb’ – Fb

where Fb = D x V x g, where D is the density of the liquid the object is submerged in, g is the force of gravity and V is the submerged volume of the object

m(s)g – m(os)g = D(l) x V x g

m(s) – m(os) = D(l) x V

we know that Mass = Density x V, which in our case would be, D(b) x V, which also means

V = Mass/D(b), where D(b) is the density of the mass

Substituting V into the above equation we get

m(s) – m(os) = [D(l) x m)/ D(b)]

Rearranging to get the ratio of density of object to the density of liquid

D(b)/D(l) = m/[m(s)-m(os)], where D(b)/D(l) denotes the specific gravity

8 0

3 years ago

P waves and S waves are alike in that they __________.

sammy [17]

<h3>Answer;</h3>

travel through solids

P waves and S waves are alike in that they both travel through solids.

<h3>Explanation;</h3>

P-waves and S-waves are types of seismic waves. These waves are produced during an earthquake, that transmit energy released around the earth.
P-waves travel the fastest and also travel through solids, liquids and gases. They are push and pull waves and thus they cause rock particles to move back and forth.
S-wave son the other hand arrive at a given point after the p-waves. They do not travel as fast as P-waves. They travel through solids but not in liquids and gases. S -waves cause the rocks to move side to side.

3 0

3 years ago

Read 2 more answers

a 200 kg crate is pushed horizontally with a force of 700 N. If the coefficient of friction is 0.2 calculate the acceleration of

Crazy boy [7]

Answer:

$a=1.54\ m/s^2$

Explanation:

Net Force

The Second Newton's law states that an object acquires acceleration when an external unbalanced net force is applied to it.

That acceleration is proportional to the net force and inversely proportional to the mass of the object.

It can be expressed with the formula:

$\displaystyle a=\frac{F_n}{m}$

Where

Fn = Net force

m = mass

The m=200 kg crate is pushed horizontally with a force Fa=700 N. The friction force opposes motion and a horizontal net force appears causing the acceleration.

The forces on the vertical direction are in balance since the crate does not accelerate in that direction, thus the weight and the normal force are equal:

N = W = mg

The friction force can be calculated by using the coefficient of friction μ:

$F_r=\mu N$

Calculating the normal force:

N = 200 * 9.8 = 1,960 N

The friction force is:

$F_r=0.2*1,960$

$F_r=392\ N$

The horizontal net force is:

$F_n = F_a-F_r=700\ N - 392\ N$

$F_n = 308\ N$

Finally, the acceleration is computed:

$\displaystyle a=\frac{308}{200}$

$\boxed{a=1.54\ m/s^2}$

3 0

3 years ago

Of all planets in our solar system jupiter has the greatest gravitational

sashaice [31]

Of all planets in our solar system Jupiter has the greatest gravitational "Force as it is heaviest Planet in the solar system"

Hope this helps!

5 0

3 years ago

Read 2 more answers

A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising th

Whitepunk [10]

Answer:

24.3KW

Explanation:

A)The kinetic energy is changing, the potential energy is changing and the chemical energy in form of fuel powering the engine also is changing

The kinetic energy is increasing as the body gain speed, the potential energy also increases as the body gain height against gravity and the chemical energy in form of fuel decreases as the body burn the fuel to create a lifting force

B) The workdone by the lifting force = the change in kinetic energy + the change in potential energy

C)The time taken in seconds to do the work is the variable needed

D) average power generated by the lifting force = (change in kinetic energy + change in potential energy) / time taken in seconds

Average power = 1/2 * m(mass) (Vf-Vi)^2 + mg(hf-hi) /t where vf is final speed and vi is initial speed at rest = 0, similarly, hf = final height and hi = initial height.

Average power = 1/2*810*7^2 + 810*9.81*8.2/3.5s

Average power = (19845+65158.02)/3.5 = 24286.577 approx 24.3kW

5 0

3 years ago