Physics, 27.09.2021 14:00, loxtin495

You travel 250 km south in 6.5 hours, turn west and travel 155km in 3 hours, then turn north and travel 32 km in 30 minutes. (A) What is the elapsed time?
(B) What is the total distance traveled?
(C) What is the total displacement?
(D) What is the average speed for the trip?
(E) What is the average velocity for the trip

Answers: 1

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Answers

answered: loredobrooke5245

Explanation:

(A) What is the elapsed time?

t = 6.5 + 3.0 + .05 = 10 hr

(B) What is the total distance traveled?

d = 250 + 155 + 32 = 437 km

d = √((250 - 32)² + 155²) = 267.48644... = 267 km

as displacement is a vector, we also need a direction

θ = arctan((250 - 32) / 155) = 54.6° S of W

(D) What is the average speed for the trip?

437/10 = 43.7 km/hr

(E) What is the average velocity for the trip

267/10 = 26.7 km/hr 54.6° S of W

answered: Guest

grav potential energy

answered: Guest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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You travel 250 km south in 6.5 hours, turn west and travel 155km in 3 hours, then turn north and tra...