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
SashulF [63]
3 years ago
6

A car moves at speed v across a bridge made in the shape of a circular arc of radius r. (a) Find an expression for the normal fo

rce acting on the car when it is at the top of the arc. (b) At what minimum speed will the normal force become zero (causing the occupants of the car to seem weightless) if r 30.0 m
Physics
1 answer:
inna [77]3 years ago
4 0

Answer:

(a) FN = m (g - \frac{v^{2} }{r})

(b) vmin = 17.146 m/s

Explanation:

The radius of the arc is

r = 30m

The normal force acting on the car form the highest point is

FN = m (g - \frac{v^{2} }{r})

If the normal force become 0 we have

m (g - \frac{v^{2} }{r}) = 0

or

g - \frac{v^{2} }{r} = 0

This way, when FN = 0, then v = vmin, so

g - \frac{vmin^{2} }{r} = 0

vmin = \sqrt[.]{g*r} = \sqrt[.]{9.8 m/s^{2} * 30m } = 17.146 m/s

You might be interested in
3. Sailors use a capstan (shown below) to raise and lower the anchor. It takes two sailors located 1 meter from the center to tu
mr_godi [17]

Answer:

B. 2 meters.

Explanation:

To rotate the capstan a certain amount of torque is required, and if each sailor applies a force F at a distance D from the center, then for two sailors the total torque will be

\tau = 2FD\\;

therefore,  for one sailor to apply the same torque it must be that the torque \tau_2 he applies must be equal to the torque that the two sailors applied:

FD_2 =2FD

which gives

D_2 = 2D.

and since D = 1\:meter,

\boxed{D_2 = 2\: meters}

which is choice B.

4 0
3 years ago
A rocket ship carrying passengers blasts off to go from New York to Hong Kong, a distance of about 13,000 km. (a) How fast (in t
lapo4ka [179]

Answer:

0.14c

0.003 s

Explanation:

See attachment

8 0
3 years ago
Two pine cones are falling from a pine tree. Both pine cones are falling at the same speed.
elena-14-01-66 [18.8K]

Answer:

Pine cone 2 does, the more mass an object has, the more kinetic energy is has.

Explanation:

Brainliest Please?

8 0
3 years ago
Read 2 more answers
What is the acceleration of 200kg mass when a net force of 100 N acts on it​
evablogger [386]

Answer:

0.5m/s^2

Explanation:

net force (resultant force) = mass x acceleration

100N/200kg = 0.5

4 0
3 years ago
Light from a distant star is collected by a concave mirror that has a radius of curvature of 150 cm. How far from the mirror is
andrey2020 [161]
The focal point of a mirror is half of the radius of curvature. We can use the formula,                                                                                                                   1/f = 1/v + 1/u                                                                                                          where f is the focal length , v is the image distance and u is object distance        The distance of the star is assumed to be incredibly far away and 1 divided by a really big number is approximately zero, thus;                                                     1/f = 1/v  = 1/75 = 1/v                                                                                             therefore; the image is formed 75 cm infront of the mirror
4 0
3 years ago
Other questions:
  • The two types of decomposers
    11·1 answer
  • What are the Characteristics of theta waves
    8·1 answer
  • A loudspeaker located in air generates sound waves of frequency 1,000 Hz. Some of these sound waves enter a pool of water, where
    9·1 answer
  • Please help me !! i am tired i worked all day to bring my grade up whitch i did i just gotta do this last assiment I will give b
    9·1 answer
  • Why x ray is called an electromagnetic wave<br>​
    10·1 answer
  • During a thunderstorm a tornado lift a car to a height of 300 m above the ground increasing and strength the tornado flings the
    9·1 answer
  • A cupboard is placed in front of a heater. Air can move through a gap under the cupboard.
    14·1 answer
  • Please help me with this
    6·1 answer
  • Which of jupiter’s moons is the largest moon in the solar system?.
    15·1 answer
  • According to the law of multiple proportions, if 12 g of carbon combine with 16 g of oxygen to form co, the number of grams of c
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!