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
Nadya [2.5K]
3 years ago
12

You have a ruler that is marked to the nearest half centimeter. Which of these measurements is written with the correct amount o

f precision?
A)2.0cm
B)3.14cm
C)5 cm
D)100cm
Physics
1 answer:
NeX [460]3 years ago
8 0
The answer would be b 3.14cm

You might be interested in
Two objects, X and Y, move toward one another and eventually collide. Object X has a mass of 2M and is moving at a speed of 2vo
Nady [450]

Answer:

The force exerted by X on Y is F to the right, and the force exerted by Yon X is F to the left.

Explanation:

There are two objects X and Y. Mass of object X is 2M, that is moving with a speed of 2v_o and that of object Y is M that is moving with a speed of v_o.

When both of the objects collide, the magnitude of the forces F the objects exert on each other is equal to :

The force exerted by X on Y is F to the right, and the force exerted by Yon X is F to the left using Newton's third law of motion. Hence, the correct option is (c).

3 0
3 years ago
describe two methods a researcher can use to avoid obtaining a nonrepresentative sample this is for high school psychology
lawyer [7]
Take a purely random sample or to deliberately pick individuals who represents the various groups
7 0
3 years ago
A student sets up an experiment to determine the inertial mass of a cart. The student has access to the following measurement eq
wlad13 [49]

Answer:

The correct answers are a and d

Explanation:

In this experiment it can be analyzed using Newton's second law

       F = m a

       m = F / m

The outside is supplied by the spring balance and is constant, therefore the acceleration of the system is also constant.

The acceleration can be found with the kinematic equations

      x = v t + ½ a t²

As we start from rest the initial speed is zero

      a = 2 x / t²

Therefore we need the reading of position and time.

Finally, the relationship between the balance reading and this acceleration of the mass of the system

Let's analyze the answers

a) True. It is one of the necessary quantities

b) False. With the equipment we cannot measure the speed directly

c) false. Acceleration is calculated

d) true. It is the other magnitude necessary for the calculation.

The correct answers are a and d

7 0
4 years ago
Read 2 more answers
The velocity of a car increases from 2.0 m/s to 16 m/s in a time
Crazy boy [7]

Answer:

4.0 m/s

Explanation:

acceleration = (16-2) /3.5 = 4 m/s

3 0
3 years ago
A boy throws a ball straight up into the air. It reaches the highest point of its flight after 4 seconds.
Zanzabum

Answer:Take into account the the Earths gravity is 9.8 meters a second

Explanation:

Gravity pulls down on the ball at g=-9.81 m/s^2. Up is positive, down is negative.The ball started at a certain initial velocity of Vi m/s. Time it took is t=4s. Final velocity is Vf=0 m/s, because at the highest point the ball stops moving.

Vf=(g*t)+Vi

Rearrange for Vi.

Vi=Vf-(g*t)

Vi=0-(-9.81*4)=39.24 m/s (upward)

Think about it this way for the non-mathematical approach. The ball stops at the top. The initial velocity gets reduced by 9.81 m/s every second, and reaches 0 m/s at the top. It took 4 seconds, so 9.81*4 is equal to the initial upward velocity.

8 0
3 years ago
Other questions:
  • After a water had boiled, the temperature of the water decreases by 22degrees. The mass of the water in the kettle is 0.50kg.The
    5·1 answer
  • An electric fan has the power output of 60W. How much work is done if the fan operates for 120s?
    10·1 answer
  • Why does the temperature increase as we go underground?
    6·1 answer
  • Air flows from a reservoir in which the pressure is kept at 124 kPa through a convergent–divergent nozzle and exhausts to the
    11·1 answer
  • The rocky planets are made of material that is much (mire/less) dense than the outer planets.​
    7·1 answer
  • ) Un círculo de 120 cm de radio gira a 600 rpm. Calcula: a) su velocidad angular
    12·1 answer
  • For a process at constant pressure, 12,400 calories of heat are released. this quantity of heat is equivalent to
    11·1 answer
  • What is the answer for this please
    14·1 answer
  • 1 pts
    6·1 answer
  • When a wire with an electric current i is placed in a magnetic field of strength b it experiences a magnetic force f. What is th
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!