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2 years ago

A ski jumper travels down a slope and

Physics

1 answer:

AleksandrR [38]2 years ago

5 0

Answer:

304.86 metres

Explanation:

The x and y cordinates are $dcos\theta$ and $dsin\theta$ respectively

The horizontal distance travelled, $x=v_{ox}t=dcos\theta$

Making t the subject, $t=\frac{dcos\theta}{v_{ox}}$

Since $y=0.5gt^2=dsin\theta$ , we substitute t with the above and obtain

$0.5g(\frac{dcos\theta}{v_{ox}})^2=dsin\theta$

Making d the subject we obtain

$d=\frac{2v_{ox}^2sin\theta}{gcos^2\theta}$

$d=\frac{2*30^2sin48}{9.8cos^248}$

d=304.8584

d=304.86m

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Average speed is the ratio of total distance moved by Chi in total time interval

So here we will have

Total distance = 100 m + 400 m

$d = 500 m = 0.5 km$

Total time taken = 5 min + 15 min = 20 min

$T = \frac{20}{60} = \frac{1}{3} hour$

now by the formula of average speed we know that

$v_{avg} = \frac{d}{T}$

$v_{avg} = \frac{0.5 km}{1/3 h}$

$v_{avg} = 1.5 km/h$

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2 years ago

If the bus had a mass of 1,021kg how much does the bus weigh?

goblinko [34]

Weight of the bus= mass x acceleration due to gravity = 1021x9.8 = 10005.8 N. Hope it helps.

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3 years ago

The final velocity of car is 20 m/s. The car is accelerating at a rate of 2.5m/s over a 10 seconds period of time. What is the i

balu736 [363]

Answer:

-5m/s

Explanation:

Since

acceleration=final velocity-initial velocity/time

2.5m/s^2=20m/s- initial velocity/10s

2.5m/s^2×10s= 20m/s -initial velocity

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2 years ago

A car travels a distance of 140 km at 70.0 km/hr. It then travels an additional distance of 60.0 km at 40.0 km/hr. The average s

Natali5045456 [20]

Answer:

57.1 km/hr

Explanation:

To find the average speed you take the total distance divided by the total elapsed time.

So, the total distance is 140 + 60 = 200

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2+1.5=3.5

The plug the numbers into the equation,

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2 years ago

For each of the motions described below, determine the algebraic sign (+, -, or 0) of the velocity and acceleration of the objec

Wittaler [7]

Answer:

A. Velocity is negative (-)

Acceleration is positive,(+)

B. Velocity is positive. (+)

Acceleration is negative (-)

C. Velocity is zero (0).

Acceleration is negative (-)

Explanation:

The elevator is said to be moving downward, therefore, its motion is in the negative direction as the positive direction is upward in the y-axis. Velocity is negative (-)

As the elevator is making an emergency stop, it is decelerating. Deceleration is negative acceleration. However, since it occurs in the opposite direction, i.e. acceleration vector is pointing upward, acceleration is positive,(+)

The motion of the ball is in the upward direction, therefore the velocity is positive. (+)

The acceleration due to the force of gravity acts in the opposite direction to that of the ball, i.e. downwards, acceleration is negative (-)

At maximum height, the ball will stop moving, therefore, velocity is zero (0).

Since acceleration due to the force of gravity acts downward, the acceleration is negative (-)

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2 years ago