1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
asambeis [7]
2 years ago
11

(I) A novice skier, starting from rest, slides down an icy frictionless 8.0° incline whose vertical height is 105 m. How fast is

she going when she reaches the bottom?
Physics
1 answer:
Vlad1618 [11]2 years ago
3 0

Answer:

v = 45.37 m/s

Explanation:

Given,

angle of inclination = 8.0°

Vertical height, H  = 105 m

Initial K.E. = 0 J

Initial P.E. = m g H

Final PE = 0 J

Final KE = \dfrac{1}{2}mv^2

Using Conservation of energy

KE_i + PE_i + KE_f + PE_f

0 + m g H = \dfrac{1}{2}mv^2 + 0

v = \sqrt{2gH}

v = \sqrt{2\times 9.8 \times 105}

v = 45.37 m/s

Hence, speed of the skier at the bottom is equal to v = 45.37 m/s

You might be interested in
Do it in order. <br> from smallest to largest
Sholpan [36]

Answer:

The earth, The sun, the solar system and the milky way.

7 0
2 years ago
A 150-newton force, applied to a wooden crate at an angle of 30° above the horizontal, causesthe crate to travel at constant vel
omeli [17]

Answer:

Explanation:

A component of 150 N in vertical direction will reduce the magnitude of reaction force.

reaction force exerted by the floor

= mg - 150 sin 30

where m is mass of the crate .

the magnitude of the horizontal component of the 150-newton force

150 cos30

= 130 N

This force tries to pull the crate in forward direction with acceleration but it has no acceleration . It is so because frictional force of equal magnitude acts on it in opposite direction which makes the net force acting on it equal to zero.

Hence frictional force is equal to 150 cos 30.

= 130 N .

3 0
3 years ago
Which statement correctly describes gravity?
Advocard [28]

Answer:

a force that attracts matter to the earth

Explanation:

depends on where you are the gravity can be different in space there is no gravity on Earth there is , that's why when you jump you come back down

5 0
2 years ago
When is the average velocity of an object equal to the instantaneous velocity?
atroni [7]

Answer:

Average velocity of an object is equal to the instantaneous velocity when it's acceleration is zero.

Explanation:

4 0
3 years ago
A pebble is dropped from rest from the top of a tall cliff and falls 53.4 m after 3.3 s has elapsed. How much farther does it dr
jeka94

Answer:

426.84 m

Explanation:

initial velocity u = 0

time t = 3.3 s

distance travelled s = 53.4 m

acceleration due to gravity = g

s = ut + 1/2 g t²

53.4 = 0 + 1/2 g x 3.3²

g = 9.8 m /s²

For the whole length of fall

distance travelled = h

total time = 6.6 + 3.3 = 9.9 s

h = ut + 1/2 g t²

u again = 0

h = .5 x 9.8 x 9.9²

= 480.24 m

distance travelled in last 6.6 s

= 480.24 - 53.4

= 426.84 m

6 0
2 years ago
Other questions:
  • The electrons of photosystem ii are excited and transferred to electron carriers. From which molecule or structure do the photos
    14·1 answer
  • Now consider the case in which the object is between the lens and the focal point. Trace the P ray (use the label P1P1P_1 for th
    10·1 answer
  • What is the primary force that helps suspension bridges use cables to hold their spans up? A. tension force B. resistance force
    11·2 answers
  • If the strength of the magnetic field at A is 48 units and the strength of the magnetic field at B is 3 units, what is the dista
    8·1 answer
  • An 8 kg cat is running 4 m/s. How much kinetic energy does it have?
    12·1 answer
  • How do the numbers of atoms of each element compare before and after the reaction? Why do you think this is?
    7·2 answers
  • Analyze if the frequency of a sound wave increases what happnes to the wavelength
    14·2 answers
  • Which statement about metals is true?
    5·1 answer
  • A car is traveling at 30 m/s ( approximately 67 mph) on I-95 highway. The driver applies the brakes and the car comes to a stop
    14·1 answer
  • A certain electric circuit obeys Ohm's law. If the resistance of the circuit is doubled, what will happen to the current through
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!