All categories

2 years ago

Which equation describes the fastest runner?

Physics

2 answers:

fomenos2 years ago

8 0

The equation distance $\bold{=2 \times \text { time }}$ describes the fastest runner.

Answer: Option D

Explanation:

The fastest runner is determined by how quick a person can reach the destination (i.e) in a less amount of time compared to others. Consider it took 10 seconds to the reach the destination x. Substitute time = 10 seconds,

$0.5 \times 10=5$

$0.33 \times 10=3.3$

$0 \times 10=0$

$2 \times 10=20$

From the four options, the highest distance travelled for constant time is distance $\bold{=2 \times \text {time}}$ .

irina [24]2 years ago

7 0

I think the answer will be A

You might be interested in

A 77.0−kg short-track ice skater is racing at a speed of 12.6 m/s when he falls down and slides across the ice into a padded wal

sukhopar [10]

Answer:

-6112.26 J

Explanation:

The initial kinetic energy, $KE_i$ is given by

$KE_i=0.5mv_1^{2$ } where m is the mass of a body and $v_i$ is the initial velocity

The final kinetic energy, $KE_f$ is given by

$KE_f=0.5mv_f^{2}$ where $v_f$ is the final velocity

Change in kinetic energy, $\triangle KE$ is given by

$\triangle KE=KE_f-KE_i=0.5mv_f^{2}-0.5mv_1^{2}=0.5m(v_f^{2}-v_i^{2})$

Since the skater finally comes to rest, the final velocity is zero. Substituting 0 for $v_f$ and 12.6 m/s for $v_i$ and 77 Kg for m we obtain

$\triangle KE=0.5*77*0^{2}-0.5*77*(0^{2}-12.6^{2})=-6112.26 J$

From work energy theorem, work done by a force is equal to the change in kinetic energy hence for this case work done equals -6112.26 J

3 0

3 years ago

A mxiture of n2 and H2 has mole fraction of 0.4 and 0.6 respectively. Determine the density of the mixture at one bar and 0 c.

SOVA2 [1]

Answer:

The density of the mixture is 0.55kg/m^3

Explanation:

P = 1bar = 100kN/m^2, T = 0°C = 273K, n = 0.4+0.6 = 1mole

PV = nRT

V = nRT/P = 1×8.314×273/100 = 22.70m^3

Mass of N2 = 0.4×28 = 11.2kg

Mass of H2 = 0.6×2 = 1.2kg

Mass of mixture = 11.2 + 1.2 = 12.4kg

Density of mixture = mass/volume = 12.4/22.7 = 0.55kg/m^3

3 0

3 years ago

2) What must be connected for an electrical current to flow in a simple current?

hjlf

2) What must be connected for an electrical current to flow in a simple current?

d.moving magnets,conductors, load to do work

here moving magnets will work as generator and conductors is used as connectors.

5)What is the purpose of a load in a circuit?

c.provide resistance to keep the voltage strong

Load will provide the resistance to the circuit and help to build the voltage across it

6) What cause an electric current from a generator

d.Magnets and conducting wires move near each other

here when magnets move near wires then it will induce the electric current and behaves like generators

7) What do all generators have in common

b.they transform mechanical into electrical energy

They have magnets and rotating coils which will convert magnetic energy to electrical energy

8) How can we measure electrical current

b.the pressure force is voltage;the # of electrons moving is amperes

this voltage and number of electrons will help to calculate current

6 0

2 years ago

2. A truck is traveling east through mud that is slowing down its speed. With west defined as negative, which of the following i

Lynna [10]

Hi! The answer is C

As west is defined as negative, the trucks velocity is positive, since its travelling east. But its speed (absolute value of velocity) is decreasing, that means that the acceleration is negative.

3 0

3 years ago

What is your hypothesis (or hypotheses) for this experiment? (about Thermal Energy Transfer)

Nesterboy [21]

Answer:

I hypothesis that the motion involving the balls in the experiment were moving to create data.

Explanation:

I hope this helps!

3 0

2 years ago