1. You throw a ball up in the air with an initial speed of 35 m/s. At what point(s) in time is

Your friend just challenged you to a race through an obstacle course. You know in order to beat him, you must run 30 meters with

seropon [69]

Answer:

Velocity = 0.5 m/s South (A)

Explanation:

You need to determine the average rate of velocity.

The equation you will use is velocity = displacement/time

The displacement is 30m South.

The time is 60 seconds.

Plug into the equation Velocity = 30m South/60 s

Velocity = 0.5 m/s South

3 0

3 years ago

List 3 ways that living creatures use proteins

ANTONII [103]

3 ways would be they are used for movement, form structure and carry out reactions, processes, and cells

6 0

3 years ago

Natasha weighs 530N. what is her kinetic energy as she swimsat

WITCHER [35]

<u>Answer:</u> The kinetic energy of Natasha as she swim is 38.88 J

<u>Explanation:</u>

Force is defined as the mass multiplied by the acceleration of the object.

Mathematically,

$F=m\times a$

where,

F = weight of Natasha = 530 N

m = mass of Natasha = ?

a = acceleration due to gravity = $9.8m/s^2$

Putting values in above equation, we get:

$530kg.m/s^2=m\times 9.8m/s^2\\\\m=\frac{530}{9.8}=54kg$

Speed is defined as the rate at which an object moves with respect to time. To calculate the speed, we use the equation:

$s=\frac{d}{t}$

where,

d = distance traveled = 72 m

t = time taken by Natasha = 1.0 min = 60 sec (Conversion factor: 1 min = 60 s)

Putting values in above equation, we get:

$s=\frac{72}{60}=1.2m/s$

Kinetic energy is defined as the energy which is possessed due to its motion. It is also defined as the half of the product of mass of the object and square of the velocity of the object.

Mathematically,

$E_K=\frac{1}{2}mv^2$

where,

$E_K$ = kinetic energy of Natasha

m = mass of the Natasha = 54 kg

v = velocity of Natasha = 1.2 m/s

Putting values in above equation, we get:

$E_K=\frac{1}{2}\times 54\times (1.2)^2\\\\E_K=38.88J$

Hence, the kinetic energy of Natasha as she swim is 38.88 J

3 0

3 years ago

True or False: The height from which cliff divers jump affects the velocity at which they will fall. Velocity is speed in a cert

Juli2301 [7.4K]

Answer:

the diver's speed is independent of the launch height.

Explanation:

For this exercise we must use Newton's second law

fr - W = m a

the friction force has the general form

fr = b v

Let's analyze this equation to find out what happens with the speed of the distant club.

When jumping, the initial speed is zero, so the friction force is zero and has an acceleration equal to the acceleration of gravity, as the speed increases the friction force increases decreasing the acceleration until it becomes zero, when it arrives at this value the velocity it has is called terminal velocity and this velocity remains fixed in relation to the trajectory.

fr = W

v = cte

The distance or time in which this equilibrium is reached is relatively fast, so the diver's speed is independent of the launch height.

8 0

3 years ago

Waves 1 and 2 show two different sound waves. Look carefully at the two waves.

algol13

I believe the correct answer is A, Wave 1 has a longer wavelength and a higher amplitude than wave 2. Both A and B are transverse wave, therefore, the wavelength is the distance between two successful crest (highest point) or two successful trough (lowest point). In this case, wave 1 has a longer wavelength than wave 2. Amplitude is the maximum displacement of particles in a wave on either side from the equilibrium point. From the diagram wave 1 as a higher amplitude compared to wave 2.

4 0

3 years ago