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3 years ago

A projectile is launched horizontally from a height of 8.0 m. The projectile travels 6.5 m before hitting the ground.

Physics

1 answer:

spayn [35]3 years ago

7 0

Answer:

5.09 m/s

Explanation:

Use the height to find the time it takes to land:

y = y₀ + v₀ᵧ t + ½ gt²

0 = 8.0 m + (0 m/s) t + ½ (-9.8 m/s²) t²

t = 1.28 s

Now use the horizontal distance to find the initial velocity.

x = x₀ + v₀ₓ t + ½ at²

6.5 m = 0 m + v₀ (1.28 s) + ½ (0 m/s²) (1.28 s)²

v₀ = 5.09 m/s

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Compare and contrast how observations and results can be used to support a conclusion to an experiment.

seropon [69]

Answer:

Explanation:

Difference Between Observation and inference. Observation can be called as the process of gathering data and inference can be said to be a process of taking decisions about the gathered data. While Observation can be said to be a factual description, inference is an explanation to the collected data.

3 0

3 years ago

a force 4000 n accelerates a car of mass 800 kg from rest to 20 ms how far does the car travel while the force is acting?

Neko [114]

Answer:

d = 40 m

Explanation:

Given that,

Force, F = 4000 N

Mass of a car, m = 800 kg

Initial velocity, u = 0 (at rest)

Final velocity, v = 20 m/s

We need to find the distance traveled. Force acting on a car is given by :

F = ma

Where

a is the acceleration of the car.

$a=\dfrac{F}{m}\\\\a=\dfrac{4000}{800}\\\\a=5\ m/s^2$

Let it has traveled d distance. Using third equation of motion.

$v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{(20)^2-(0)^2}{2\times 5}\\\\d=40\ m$

So, the required distance is equal to 40 m.

4 0

2 years ago

A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/s in 6.00 seconds. She then

MrRissso [65]

Answer:

914m

Explanation:

We must divide the parachutist motion into three parts:

First we have free fall motion:

$y_1=\frac{v_f^2-v_0^2}{2g}\\y_2=\frac{(58.8\frac{m}{s})^2-0^2}{2(9.8\frac{m}{s^2})}=176.4m$

Then, we have a uniformly accelerated motion. The initial speed is this part will be the same final speed as the previous part.

$a=\frac{v_f-v_0}{t}\\a=\frac{10.0\frac{m}{s}-58.8\frac{m}{s}}{4s}=-12.2\frac{m}{s^2}\\y_2=\frac{v_f^2-v_0^2}{2a}\\y_2=\frac{(10.0\frac{m}{s})^2-(58.8\frac{m}{s})^2}{2(-12.2\frac{m}{s^2})}=137.6m$

Finally, we have a uniform linear motion:

$y_3=v*t\\y_3=10\frac{m}{s}*60s=600m$

The total heigh will be the sum of all heights:

$y=y_1+y_2+y_3\\y=176.4m+137.6m+600m=914m$

7 0

3 years ago

when a person is making cardiovascular gains through aerobic activity, they are increasing what to the lungs and heart?

gladu [14]

When a person is making cardiovascular gains through aerobic activity they are increasing the amount of oxygen to the heart and lungs. This keeps the heart and lungs of a person very healthy. It decreases the chance of heart diseases.

8 0

3 years ago

HELP PLEASE!!!!

azamat

Answer:

read a pleasant story to him Because if you threaten him meaning abusing him then you could go to jail for that if you read him a pleasant story to him then he will go to bed faster if you play an activity game he'll stay up longer and if you watch an exciting TV show he'll stay up longer too soon you just want him to go to bed sleep peacefully and that's why you read him a pleasant story So yeah my answer is read a pleasant story to him so he can go to bed and not be threatened or play an activity game or watch an exciting TV show if you want them to go to sleep That is why I put read a pleasant story to him

7 0

2 years ago