a 1250 kg car accelerates from rest to 6.13m/s over a distance of 8.58m calculate the average force of traction

In the reaction at Blood Falls, iron and oxygen combine to form iron oxide, which is called rust (water is also present). The re

Maru [2360]

A reactant is any substance that takes part in a chemical reaction. Conversely, a product is what emerges from the chemical transformation. A familiar example of a chemical change is rust formation. In this reaction, oxygen and iron, which serve as the reactants, react to produce a substance known as iron oxide, or rust.

3 0

10 days ago

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A 5 kg block moves with a constant speed of 10 ms to the right on a smooth surface where frictional forces are considered to be

Yuliya22 [2438]

Answer:

The work done, W = 19.6 J

Explanation:

It’s provided that

The mass of the block, m = 5 kg

The velocity of the block, v = 10 m/s

The coefficient of kinetic friction between the block and rough surface is 0.2

Distance traveled by the block, d = 2 m

As the block traverses the rough section, it loses energy equal to the work done by the kinetic energy.

$W=\mu_kmgd$

$W=0.2\times 5\times 9.8\times 2$

W = 19.6 J

Thus, the change in kinetic energy of the block moving through the rough section is 19.6 J. Consequently, this is the required answer.

5 0

4 days ago

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A camera operator is filming a nature explorer in the Rocky Mountains. The explorer needs to swim across a river to his campsite

inna [2210]

Answer:

a. Angle= 28.82°

b. Approved. Although he might feel cold, he should be able to cross.

Explanation:

Velocity Vector

Velocity is a measure of how quickly something is moving in a specific direction. It is represented as a vector that has both magnitude and direction. If an object can only move in one direction, then speed can serve as the scalar equivalent of that velocity (only focusing on magnitude).

a.

The explorer aims to swim across a river to reach his campsite, as depicted in the image below. The river's velocity is vr and the explorer's swimming speed in still water is ve. If he were to swim straight towards the campsite, he would end up downstream due to the river's current. Therefore, he must swim at an angle that allows him to overcome the current while still moving towards his goal. This angle relative to the shore is what we need to determine. The explorer's speed can be broken down into its horizontal (vx) and vertical (vy) components. In order to counteract the river's flow:

$v_{ey}=v_r$

We can calculate the vertical component of the explorer's swimming speed as

$v_{ey}=|v_e|cos\alpha$

Thus

$v_r=|v_e|cos\alpha$

Finding the value of $\alpha$

$\displaystyle cos\alpha=\frac{v_r}{|v_e|}$

$\displaystyle cos\alpha=\frac{0.665}{0.759}=0.876$

Then the angle is given by

$\alpha=28.82^o$

b.

The component of the explorer's velocity that goes horizontally is

$v_{ex}=0.759sin28.82^o$

$v_{ex}=0.366\ m/s$

This represents the actual velocity directed towards the campsite

Considering that

$\displaystyle v=\frac{x}{t}$

To find t

$\displaystyle t=\frac{x}{v}$

Calculating the duration for the explorer to cross the river

$\displaystyle t=\frac{29.3}{0.366}$

$t=80\ sec$

As this time is under the hypothermia threshold (300 seconds), the conclusion is

Approved. Although he will feel cold, he should manage to cross successfully.

3 0

27 days ago

What is the minimum frequency of light necessary to emit electrons from titanium via the photoelectric effect?

kicyunya [2264]

E = h x f 

Thus: 

f = E / h 
f = 4.41•10^-19 / 6.62•10^-34 
f = 6.66•10^14 Hz (s^-1) 

b/ What is the wavelength of this light? 
------------------------------ 

λ = c / f 
λ = 3•10^8 / 6.66•10^14 
λ = 4.50•10^-7 m

4 0

28 days ago

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For each of the motions described below, determine the algebraic sign (+, -, or 0) of the velocity and acceleration of the objec

serg [2593]

Part A: -,+

The elevator descends, dictating the velocity's direction, which aligns with the movement's path. With the positive direction defined as upward, the velocity is negative. After the emergency button is pressed, the elevator begins to stop, indicating that the velocity is decreasing. Therefore, the acceleration is oriented in the opposite way to the velocity, making its sign +.

Part B: +, -

The ball ascends, which determines the positive direction of the velocity. Hence, the velocity is positive.

Once the ball is thrown, the only force acting on it is gravity, opposing the ball’s ascent and causing it to descend. This means the acceleration is directed downwards, resulting in a negative sign.

Part C: 0, -

Throughout the ball's trajectory from the moment it's thrown until it drops to the ground, gravity constantly exerts downward acceleration (-).

After the throw, the ball's velocity will decline due to gravity. When it reaches a velocity of 0, it achieves its peak height. At this specific moment, the ball begins to descend again under the influence of gravity. However, at the peak height, the ball's velocity is 0.

7 0

1 month ago