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3 years ago

Can someone help pleaseeee

Physics

1 answer:

Eduardwww [97]3 years ago

4 0

Answer:

Motion with constant velocity of magnitude 1 m/s (uniform motion) for 4 seconds in a positive direction and then for 2 seconds uniform motion with constant velocity of magnitude 3 m/s in reverse direction .

Explanation:

The graph shows a constant velocity of 1 m/s for 4 seconds in the positive direction. After that, between 4 seconds and 6 seconds, the object reverses its motion with constant velocity of magnitude 3m/s.

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Make a graph of the data. You may use a graphing program. Think about what data should be on the y-axis and the x-axis. Be sure

Lynna [10]

Answer:

yes it was a constant speed and the car traveled 10 meters in 20 seconds.

Explanation:

8 0

3 years ago

Nucleus A decays into the stable nucleus B with a half-life of 22.07 s. At t=0 s there are 1,293 A nuclei and no B nuclei. At wh

Alexeev081 [22]

Answer:

29.38 seconds

Explanation:

Half life, T = 22.07 s

No = 1293

Let N be the number of atoms left after time t

N = 1293 - 779 = 514

By the use of law of radioactivity

$N=N_{0}e^{-\lambda t}$

Where, λ is the decay constant

λ = 0.6931 / T = 0.6931 / 22.07 = 0.0314 decay per second

so,

$514=1293e^{-0.0314t}$

$2.5155=e^{0.0314t}$

take natural log on both the sides

0.9225 = 0.0314 t

t = 29.38 seconds

5 0

2 years ago

What is the acceleration of an object that moves at constant velocity? What is the net force on the object in this case? What is

Misha Larkins [42]

Answer: What is the acceleration of an object that moves at constant velocity? Acceleration is Zero

What is the net force on the object in this case? The ner force is also Zero

Explanation: If the velocity is constant means that the acceleration is zero, from Newton second law is clear that net force is also zero

Fnet= m* a as v is constant a=0 this Fnet is zero.

3 0

2 years ago

The missile s engine exerts a 260-kN force F.

alexdok [17]

Answer:

a)F=(208 i+156 j) kN

b)F+W=219 kN

Explanation:

Solution:

To determine the components of F

F=(260 kN).( $\frac{4}{\sqrt{4^{2}+3^{2}}}i+\frac{3}{\sqrt{4^{2}+3^{2}}}j$ )

=(208 i+156 j) kN

F=(208 i+156 j) kN

b)weight W expressed in component and add into the

Force F.

W=-(8800 kg).(9.81 m/s^2)j

F+W=(208 i+[156-86.3]j) kN

F+W= $\sqrt{(208kN)^{2}+(-69.7kN)^{2} }$

=219 kN

F+W=219 kN

6 0

3 years ago

In the sentence "The speed of an object can vary," what does the word vary mean?

xenn [34]

Vary means very many

4 0

3 years ago