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
blsea [12.9K]
3 years ago
7

4. A latch holding a cart in place, hanging high above the ground, breaks and the cart falls. The cart started from rest and is

in free fall until it hits the ground.
a. What is the velocity after 3.2 s?



b. How far has the cart fallen at 3.2 s?
Physics
1 answer:
scoray [572]3 years ago
7 0

Answer:

a) 31.4 m/s

b) 50.2 m

Explanation:

a) When an object is free falling, its speed is determined by the gravity force giving it acceleration. Equation for the velocity of free fall started from the rest is:

v = g • t

g - is gravitational acceleration which is 9.81 m/s^2, sometimes rounded to 10

t - is the time of free fall

So:

v = 9.81 m/s^2 • 3.2

v = 31.4 m/s ( if g is rounded to 10, then the velocity is 10 • 3.2 = 32 m/s)

b) To determine the distance crossed in free fall we use the equation:

s = v0 + gt^2/2

v0 - is the starting velocity (since object started fall from rest, its v0 is 0)

s = gt^2/2

s = 9.81 m/s^2 • 3.2^2 / 2

s = 50.2 m (if we round g to 10 then the distance is 10 • 3.2^2/2 = 51.2 meters)

You might be interested in
A girl runs once around a circular track with a radius of 100m at speed of 10m/s.
goblinko [34]

Answer:

0 m

Explanation:

Displacement is the shortest distance from one ppont to another. Here, the girl returns to the same spot after running. Hence, displacement is <u>0</u><u> </u><u>m</u>.

5 0
3 years ago
Two movers are pushing a large crate with a force of 60.0 n each. one pushes north, the other east. what is the equilibrant forc
romanna [79]
To get the solution you must need to draw a force triangle. Attach the head of the 60N north force arrow with the tail of the 60N east force arrow. The subsequent is the arrow connecting he tail and head of the two arrows. 
You get a right angled triangle, and the resultant is (60^2 + 60^2) ^0.5 = 84.85 N or 85 N northeast.
8 0
3 years ago
The current through a heater is 12 A when it is plugged into a
jasenka [17]

Answer:

A. 10Ω

Explanation:

7 0
3 years ago
Consider a horizontal layer of the dam wall of thickness dx located a distance x above the reservoir floor. what is the magnitud
sergejj [24]
The force on the layer will be equivalent to the weight of water on it. This is given by:
F = mg; m is the mass of water and g is the acceleration due to gravity.
5 0
3 years ago
Read 2 more answers
An ocean wave has a wavelength of 10 m and a frequency of 4.0 Hz. What is the velocity of the
aleksandr82 [10.1K]

The velocity of the wave is 40 m/s

Explanation:

The relationship between the velocity of a wave and its frequency and wavelength is given by

v=f \lambda

where

v is the velocity

f is the frequency

\lambda is the wavelength

For the ocean wave in this problem, we have:

\lambda = 10 m (wavelength)

f = 4.0 Hz (frequency)

Therefore, its velocity is

v=(4.0)(10)=40 m/s

Learn more about waves:

brainly.com/question/5354733

brainly.com/question/9077368

#LearnwithBrainly

3 0
3 years ago
Other questions:
  • Find the volume of a box with length 25 cm, height 25 cm and width 1.0 m.
    11·1 answer
  • A ball is thrown straight up with an initial velocity of 6.4 m/s. It travels for 0.64 seconds, and has a change of position of 2
    7·1 answer
  • Which of the following statements can be concluded (deducted) from the parallel-axis theorem? The area moment of inertia of an a
    12·1 answer
  • Name six kinds of simple machines.
    10·2 answers
  • A 65-cm segment of conducting wire carries a current of 0.35
    12·2 answers
  • Hilda pushes her sofa across the room with a force of 40 N. It accelerates at 2 m/s/s. What is the mass of the sofa?
    6·2 answers
  • A kid throws a pencil straight up at
    8·2 answers
  • A thin block of soft wood with a mass of 0.072 kg rests on a horizontal frictionless surface. A bullet with a mass of 4.67 g is
    15·1 answer
  • When hydrogen is heated or subjected to an electric discharge, it emits light with specific visible wavelengths. A diffraction g
    6·1 answer
  • Two point charges, initially 3 cm apart, are moved to a distance of 1 cm apart. By what factor does the resulting electric force
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!