PHYSICS HIGH SCHOOL

Please help me! In a collision, Kara Less who was traveling at 11 m/s while texting in her 1300 kg car, is struck by another vehicle and finds herself and her phone suddenly moving 2.5 m/s in the opposite direction. What impulse does she experience? SHOW WORKAnswer Choices

A. -12,000
B. -14,000
C. -16,000
D. -18,000

Answers

Answer 1

Answer:

Answer:

D. -18,000

Explanation:

Let's define impulse :

Impulse is defined as the product of Force ( N ) applied on the body and the time of impact ( s ) or
The change in momentum

hence in this question ,

kara is initially moving with the :

velocity $v_(i)$ = 11 $ms^(-1)$

finally moving with velocity $v_(f)$ = -2.5 $ms^(-1)$ (minus as she moves in the opposite direction )

therefore the initial momentum $p_(i)$ = $m*v_(i) = 1300*11 = 14300 kgms^(-1)$

and the final momentum $p_(f)$ = $m*v_(f) = 1300*-2.5= 3250 kgms^(-1)$

thus the change in momentum : $p_(f)$ - $p_(i)$

= -3250-14300 = -17550 $kgms^(-1)$ ≅ -18000 $kgms^(-1)$

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Poise under pressure, dealing with adversity, and self-esteem are all parts of which type of health? A. emotional health B. mental heal C. physical health D. social health

Answers

Answer:

The correct answer is option B, Mental Health

Explanation:

Mental health is referred to as mental illness when a person is bounded by prolonged negative thoughts. The ongoing signs and symptoms of a poor mental health can cause frequent stress and reduced ability to function. Some common symptoms of mental illness include

• Excessive anger, hostility or violence

• Extreme mood changes

• Confused thinking or reduced ability to concentrate

• Excessive fears or worries

The answer is B.) Mental health

What change takes place in a wave when the frequency of the wave increases? A.fewer wavelengths pass a given point per second

B.no change occurs in the number of wavelengths that pass a given point per second

C.a greater number of wavelengths pass a given point per second

D.the number of wavelengths that pass a given point per second doubles

Answers

The answer is C. As the frequency of the waves increases, a greater number of wavelengths pass a given point per second. From the wave formula, we see that there is an indirect relationship between frequency and the wavelength. thus, as the frequency increases the wavelength decreases resulting to a smaller distance between the waves which will show greater number of wavelengths between waves.

What is the acceleration due to gravity at a location where a 15 kilogram mass weighs 45 newtons?

Answers

   Weight = (mass) x (acceleration of gravity) .

   45 N = (15 kg) x (acceleration of gravity) .

Divide each side by (15 kg):

   Acceleration of gravity = (45 N) / (15 kg)

   = 3 m/s² .

The acceleration due to gravity at the place where the weight of the body is $45\,{\text{N}}$ is $\boxed{3\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{{{\text{s}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace}{{{\text{s}}^{\text{2}}}}}}$ .

Further Explanation:

Given:

The mass of the body is $15\,{\text{kg}}$ .

The weight of the body is $45\,{\text{N}}$ .

Concept:

The weight of an object or a body is the measure of the force of the gravity or the Earth’s gravitational force acting on the body. It is the amount of force with which the body is being pulled towards the center of the Earth.

The weight of the body is expressed as the product of the mass and the acceleration due to gravity on the surface.

The expression for the Weight of any body is written as:

$\boxed{W=mg}$

Here, $W$ is the weight of the body, $m$ is the mass and $g$ is the acceleration due to gravity.

Substitute the values of mass and the weight in above expression.

$\begin{aligned}45&=15*g\ng&=\frac{{45}}{{15}}\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{{{\text{s}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace}{{{\text{s}}^{\text{2}}}}}\n&=3\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{{{\text{s}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace}{{{\text{s}}^{\text{2}}}}}\n\end{aligned}$

Thus, the acceleration due to gravity at the place where the weight of the body is $45\,{\text{N}}$ is $\boxed{3\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{{{\text{s}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace} {{{\text{s}}^{\text{2}}}}}}$ .

Learn More:

1. A 30.0-kg box is being pulled across a carpeted floor by a horizontal force of 230 N brainly.com/question/7031524

2. A horizontal rope is tied to a 50 kg box brainly.com/question/2416204

3. Why is it important to define a frame of reference brainly.com/question/526888

Answer Details:

Grade: High School

Subject: Physics

Chapter: Newton’s law of Motion

Keywords:

Weight, mass, acceleration due to gravity, gravity at the location, weighs 45 newtons, 15 kilogram, w=mg, g=3m/s^2, weight of the object.

Does your body get all its energy from the Sun

Answers

No, humans get energy from the foods we eat. If we could get energy from the sun, there would be no need for eating. Producers, plants,are the ones who get energy from the sun. We get our energy from either the plant (fruits and veggies)or the animal who ate the plant (cow,pig,chicken etc) :D

I'm taking physics and trying to figure out the 4 questions to this problem.

Answers

Answer:

Explanation:

At t = 1 velocity = 0

At t = 3 velocity = 3

slope of the line = 3-0 / 3-1 = 3/2

At t = 2

velocity = 3/2 x ( 2 - 1 )

= 1.5 m /s

velocity at t = 2 is 1.5 m /s

Position at t = 2 :

displacement at t = 2

area of graph upto t = 2

= 1 / 2 x 1 x 1.5 = .75

position at t = 2 :

= initial position + displacement

= 10 + .75 = 10.75 m

position at 6 s :

displacement at t = 6

area of curve upto t = 6

= 1 / 2 x 2 x 3 + 3 x 3 + 1/2 x 3 x ( 4.5 - 3 )

= 3 + 9 + 2.25

= 14.25 m

position at t = 6

= initial position + displacement

= 10 + 14.25 = 24.25 m

position at 9 s :

displacement at t = 9

area of curve upto t = 9

= 1 / 2 x 2 x 3 + 4 x 3 + 1/2 x 4 x ( 5 - 3 )- 1/2 x 2 x 1.5

= 3 + 12 + 4 - 1.5

= 17.5 m

position at t = 9

= initial position + displacement

= 10 + 17.5 = 27.5 m

Which statement best compares the accelerations of two objects in free fall? A) The heavier object has a greater acceleration.
B) The object that has the greater surface area has the lower acceleration
C) The object that has the smaller mass has the greater acceleration
D) The objects have the same acceleration

Answers

Answer: option D). The objects have the same acceleration.

The acceleration of both objects is g (acceleration of gravity).

In freefall the only force acting is the attraction of the earth (gravity). There is not air resistance.The acceleration is not dependent either of the mass or the surface area of the object.

The answer is: D) The objects have the same acceleration.

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