Select ALL of the places you might find DNA evidence.
saliva on gum
blood spatter on the wall
inside a femur bone found in the woods
cells on root of hair found at the scene

Answer:

11.85 k

Explanation:

11.85 k

Answer:

The answer is below

Explanation:

A 140 kg load is attached to a crane, which moves the load vertically. Calculate the tension in the

cable for the following cases:

a. The load moves downward at a constant velocity

b. The load accelerates downward at a rate 0.4 m/s??

C. The load accelerates upward at a rate 0.4 m/s??

Solution:

Acceleration due to gravity (g) = 10 m/s²

a) Given that the mass of the crane (m) is 140 kg. If the load moves downward, the tension (T) is given by:

mg - T = ma

Since the load has a constant velocity, hence acceleration (a) = 0. Therefore:

mg - T = m(0)

mg - T = 0

T = mg

T = 140(10) = 1400 N

T = 1400 N

b)  If the load moves downward, the tension (T) is given by:

mg - T = ma

T = mg - ma = m(g - a)

T = 140(10 - 0.4) = 140(9.96) = 134.4

T = 134.4 N

c)  If the load moves upward, the tension (T) is given by:

T - mg = ma

T = ma + mg = m(a + g)

T = 140(0.4 + 10) = 140(10.4)

T = 145.6 N

2) To find the distance (s) if the load move from rest (u= 0) and accelerates for 20 seconds (t = 20). We use:

s = ut + (1/2)gt²

s = 0(20) + (1/2)(10)(20)²

s = 2000 m

The rocket's velocity is 0.862c relative to the observer.

In this scenario, the rocket is moving at a velocity of 0.862c to the right. The term "c" represents the speed of light, which is approximately 299,792,458 meters per second. To calculate the rocket's velocity, simply multiply 0.862 by the speed of light.

The velocity of the rocket is relative to an observer or a reference frame. This means that the rocket's speed is being measured compared to the position of an observer, which could be a person, a device, or another object. In this case, the rocket is moving at a velocity of 0.862 times the speed of light, which is a significant fraction of the speed of light and would cause relativistic effects, such as time dilation and length contraction, to become noticeable.

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(a)The critical value for a 95% confidence level is approximately 1.96. (b) A higher confidence level requires a wider interval to capture the true population mean with greater certainty.

(a) To construct a 95% two-sided confidence interval on the mean life of the light bulbs, we can use the formula:

CI = X ± z × (σ ÷√n)

where X is the sample mean, σ is the population standard deviation, n is the sample size, and z is the critical value corresponding to the desired confidence level.

In this case, X= 1014 hours, σ = 25 hours, and n = 20. The critical value for a 95% confidence level can be found using a standard normal distribution table or a calculator. For a two-sided confidence interval, we divide the desired confidence level by 2 and find the corresponding z-value.

The critical value for a 95% confidence level is approximately 1.96. Substituting the values into the formula, we have:

CI = 1014 ± 1.96 × (25 ÷ √20)

the confidence interval on the mean life.

(b) To construct a 95% lower-confidence bound on the mean life, we can use the formula:

Lower bound = X - z × (σ ÷ √n)

Using the same values as in part (a), the lower bound can be calculated.

The lower bound from part (a) is the lower confidence bound for the mean life.

For the second part of the question, we have two confidence intervals: (38.02, 61.98) and (39.95, 60.05).

(a) To find the value of the sample mean, we take the average of the lower and upper bounds of each confidence interval. The sample mean is the midpoint of the confidence interval.

Sample mean = (38.02 + 61.98) ÷ 2 = 50

(b) One of the intervals is a 95% confidence interval, and the other is a 90% confidence interval. The interval (38.02, 61.98) is the 95% confidence interval because it is wider. A higher confidence level requires a wider interval to capture the true population mean with greater certainty.

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Answer:

Power = 66 Watts

Explanation:

Given the following data;

Energy = 3960 Joules

Time = 60 seconds

To find the power output;

Power can be defined as the energy required to do work per unit time.

Mathematically, it is given by the formula;

\( Power = \frac {Energy}{time} \)

Substituting into the equation, we have

\( Power = \frac {3960}{60} \)

Power = 66 Watts

Answer:

El trabajo realizado por la niña es 25.9 J.

Explanation:

El trabajo ue hace la niña viene dado por:

\( W = |F|*|d|*cos(\theta) \)    

En donde:

F: es la fuerza realizada = 10 N

d: es el desplazamiento = 300 cm

θ: es el ángulo entre la fuerza y el desplazamiento = 30°

Entonces, el trabajo es:

\( W = |F|*|d|*cos(\theta) = 10 N*3 m*cos(30) = 25.9 J \)    

Por lo tanto, el trabajo realizado por la niña es 25.9 J.

Espero que te sea de utilidad!        

Answer:

The final velocity of the car can be calculated using the equation:

v = u + at

where:

v = final velocity

u = initial velocity (since the car starts from a full stop, the initial velocity is 0)

a = acceleration (0.12 m/s^2)

t = time (unknown, but can be calculated using the distance and velocity)

To find the time, we can use the distance and velocity formula:

d = ut + (1/2)at^2

75 = 0 + (1/2)(0.12)(t^2)

t = sqrt(75/(1/2)(0.12))

t = sqrt(625/0.06)

t = sqrt(10416.67)

t = 102.41 seconds

Now we can substitute the values for u, a and t into the first equation to find the final velocity:

v = u + at

v = 0 + (0.12)(102.41)

v = 12.29 m/s

The magnitude of the final velocity of the car is 12.29 m/s.

Answer:

Below

Explanation:

To convert K to °C    just subtract 273.15   from the K  value

Answer:

Steam distillation is a separation process which consists in distilling water together with other volatile and non-volatile components.

Answer:

b. momentum, mass

Explanation:

If you increase the mass of an object, the momentum of the object increases proportionally

Answer:

B is correct.

Explanation:

Please give me brainliest :)

Answer:

100 meters

Explanation:

the displacement is the distance from which it started, so if it falls 100 meters, then it has a 100 meter displacement

Answer:

10,000

Explanation:

200,000/20 = power needed

200,000/20 = 10,000

Hope this Helps!

Answer:

10,000 Watts

Explanation:

Power is the ratio of work to time, or work over time. It can be found using the following formula.

p=w/t

where p is the power, w is the work, and t is the time.

The project needed 200,000 Joules, and it took 20 seconds to complete the project. Therefore, w=200,000 and t=20. Substitute these values into the formula.

p=200,000/20

Divide

p=10,000

Add appropriate units. The units for power is Watts.

p=10,000 Watts

10,000 Watts of power is needed.

Answer:

D

Explanation:

Answer:

20.41 m

Explanation:

Let's list out the relevant variables in this problem. Take the upwards direction to be positive and the downwards to be negative.

We are using the fact that at maximum height, the object's velocity is 0 m/s right before it changes direction to fall vertically back down to Earth.

Find the constant acceleration equation that contains these four variables.

Substitute the known values into the equation and solve for Δy, the maximum height.

The maximum height of the stone is 20.41 m. Notice that its mass was irrelevant when solving for its maximum height when thrown.

Answer:

Ok, the answer is because there will not be enough sunlight for a spacecraft to power all the way.

Answer:

This statement is true, a heating curve is a graph that shows the temperature change of a substance as thermal energy is introduced.

A heating curve is a graph that represents the temperature change of a substance as thermal energy is introduced.

The heating curve can be described as the relationship between the heating supply temperature and the outside air temperature of the system. The heating curve gives what temperature the boiler is to heat the water at an outdoor temperature.

Heating curves indicate how the temperature changes as a substance are heated up. Cooling curves are generally the opposite of the heating curve. They indicate how the temperature changes as a substance are cooled down. Similar to heating curves, cooling curves have horizontal parts where the state transforms from gas to liquid/ from liquid to solid.

The heating curve represents the material in phases of solid, liquid, and gas. As this graph is a plot of T v/s q, the slope is 1/mC. As the heating continues, the solid substance melts. During this time the temperature remains constant. The length of the line can be described as the amount of heat required to melt the solid.

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Answer:

18 rotations

3 minutes

rotations per minute (RPM) = 18/3 = 6

Explanation:

First, take into account that the difference in time between the third chirp and the third echo is:

t = 0.10s - 0.02s = 0.08s

next, consider that in such a time, the sound emitted by the bat travels twice the distance in between the bat and the moth, then, you have:

2d = v*t

where v is the speed of sound 340 m/s

solve the equation above for d, and replace the values of the previous parameters, as follow:

d = v*t/2

d = (340 m/s)(0.08 s)/2

d = 13.6 m

Hence, the distance between the moth and the bath is 13.6 m

Answer:

mass

Explanation:

mass is used in measuring weight. for example kg, tonnes

The question requires us to find out Part B, given that Chan 20 in Woturn Hresses.

The answer is to be expressed to three significant figures.Let us first try to understand what is meant by Chan 20 in Woturn Hresses. Chan is the name of the cylinder that is being used in this problem. Woturn Hresses is a unit of measure that represents the torque required to turn a cylinder.

Chan 20 in Woturn Hresses means that it requires 20 units of torque to turn the cylinder. Now let's proceed to Part B.To calculate Part B, we need to use the following formula:Part B = (Part A * Chan) / (Torque * Radius)The values of Part A, Chan, Torque, and Radius are given to us.

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the force between the two wires if they are separated by 2.50 cm is 0.525 N.

Given that force F between two parallel wires carrying electric currents is inversely proportional to the distance d between the wires and that a force of 0.750 N exists between wires that are 1.75 cm apart and that we are supposed to find the force between them if they are separated by 2.50 cm.

Let the initial force be F₁ and the initial distance be d₁.

Therefore, we can write the relationship between force and distance as;

F₁d₁ = F₂d₂

Where

;F₁ = 0.750 N (initial force)

d₁ = 1.75 cm (initial distance)

F₂ = ? (force at new distance)

d₂ = 2.50 cm (new distance)

Let us find F₂;F₁d₁ = F₂d₂F₂ = F₁d₁/d₂

Now substitute the values we know;

F₂ = (0.750 N x 1.75 cm) / 2.50 cmF₂ = 0.525 N

Therefore, the force between the two wires if they are separated by 2.50 cm is 0.525 N.

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The independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.The dependent variable, the one that you measure the response in, is the distance that the washers travel.

The independent variable in an experiment is the variable that is manipulated by the researcher. It is the variable that is intentionally changed by the researcher to examine the impact of this change on the dependent variable.The dependent variable, on the other hand, is the response that is measured by the researcher.

It is the variable that is being influenced by the independent variable in an experiment. Thus, in the given experiment, the car's hitting the barrier is the independent variable while the distance that the washers travel is the dependent variable.

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Answer:

V = IR

Explanation:

V = voltage

I = current

R = resistance

Answer:

I can't understand you're que... plzz write in a correct way..

Assuming the speed of the wave is taken as the speed of sound wave in air that is 340 m/s. The wavenumber for 262 Hz is 0.77 m⁻¹ and that for 294 Hz is 0.86 m⁻¹ .

The wave number of a wave is the number of wavelengths passing through unit length. It is the inverse of wavelength.

Wave number is directly proportional to the frequency.

The relation between frequency and wave number is written as:

wave number = ν/v

where v is the speed of the wave and ν is the frequency.

The wave number of the wave with the frequency of 330 Hz is then,

330 Hz/ 340 m/s = 0.97  m⁻¹

and for the remaining frequencies:

349 Hz /340 m/s =  1.052  m⁻¹

for 392 Hz,

392 Hz/340 m/s = 1.15  m⁻¹

For 440 Hz,

440 Hz/340 m/s = 1.29  m⁻¹.

for 494 Hz,

494 Hz/340 m/s = 1.45  m⁻¹

and  for 523 Hz,

523 Hz/340 m/s = 1.53  m⁻¹

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The half-life of a radioactive substance is the time it takes for half of the substance to decay. So, if there is 1500 mg of kryptonite at 10 am, then there will be 750 mg of kryptonite left after 5 hours, 375 mg of kryptonite left after 10 hours, and so on.

The function that models this situation is A(t)=1500(0.5) t

where A(t) is the amount of kryptonite left after t hours.

To find how much kryptonite will be left at 1 pm, we can substitute t=5 into the function. This gives us A(5)=1500(0.5) 5

=375 mg.

So, there will be 375 mg of kryptonite left at 1 pm.

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