Physics, 13.12.2019 21:31 SapphireWolf

Any for the questions will be great

Answers: 1

Show answers

Answers

Answer from: aliopqwas

1) The mass of the skier, m = 51.02 kg

2) At top of the hill, v = 0

3) The velocity of the skier at the 30 m height, v = 37.04 m/s

4) The velocity of the skier at the bottom of the hill, v = 44.27 m/s

Explanation:

Given data,

The initial height of the skier from the ground, h = 100 m

The K.E of skier at 100 m = 0 J

The P.E of the skier at 100 m = 50,000 J

1) The mass of the skier,

m = P.E/ gh

= 50,000/ (9,8 x 100)

= 51.02 kg

2) The velocity of the skier at the top of the hill,

At top of the hill, the K.E = 0,

Hence,

v = 0

3) The velocity of the skier at the 30 m height,

P.E = mgh

= 51.02 x 9.8 x 30

= 14,999.88 J

E = P.E + K.E

K.E = E - P.E

= 50,000 - 14,999.88

= 35000.12 J

v = √(2 K.E/m)

= √(2 x 35000.12 / 51.02)

v = 37.04 m/s

4) The velocity of the skier at the bottom of the hill,

At bottom of the hill, P.E = 0 and K.E is maximum

K.E = 50,000 J

v = √(2 K.E/m)

= √(2 x 50000 / 51.02)

v = 44.27 m/s

Answer from: Quest

here we know that ball will drop down by total distance 3.2 m

so here we know that

$v_{yi} = 0$

$\delta y = - 3.2 m$

now using kinematics

$\delta y = v_{yi} t + \frac{1}{2}at^2$

$-3.2 = 0 -\frac{1}{2}(9.8) t^2$

$t = 0.81 s$

now in the same time it will cover horizontal distance of 0.75 m

$\delta x = 0.75m$

so speed of the ball will be

$v = \frac{delta x }{\delta t}$

$v = \frac{0.75}{0.81} = 0.93 m/s$

Answer from: Quest

answer: 31, 5556. 952 seconds

Another question on Physics

Physics, 21.06.2019 23:30

Edward tolman explained the results of his study by theorizing that the rats were learning about the maze during every trial but they a. were agitated because other groups were getting reinforcement b. could not remember how to demonstrate it without reinforcement c. were not motivated to demonstrate it without reinforcement d. seemed to be too lazy to actually work without reinforcement

Answers: 3

Answer

Physics, 22.06.2019 04:30

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

Answers: 2

Answer

Physics, 22.06.2019 07:30

Select all of the following that are equal to an impulse of 20 unitsa) force= 5, time= 5.5b) force= 25, time= 0.8c) force= 0.1, time= 200d) force= 10, time= 2(its b, c, and d)(also in order to find answer they have to add to get the unit)ex= 25x.8=20 or .1x200=20

Answers: 1

Answer

Physics, 22.06.2019 08:00

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

Answers: 2

Answer

You know the right answer?

Any for the questions will be great
...

Questions