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
oksian1 [2.3K]
3 years ago
15

Two blocks are connected by a light weight, flexible cord that passes over a frictionless pulley.Ifm1=2 kg and m2 = 3 kg, and bl

ock 2 is initially at rest 1.96 m above the floor, how long does it take block 2 to reach the floor?
Physics
1 answer:
Vera_Pavlovna [14]3 years ago
6 0

Answer:

t = 1.41 sec.

Explanation:

If we assume that the acceleration of the blocks is constant, we can apply any of the kinematic equations to get the time since the block 2 was released till it reached the floor.

First, we need to find the value of  acceleration, which is the same for both blocks.

If we take as our system both blocks, and think about the pulley as redirecting the force simply (as tension in the strings behave like internal forces) , we can apply Newton's 2nd Law, as they were moving along the same axis, aiming at opposite directions, as follows:

F = m₂*g - m₁*g = (m₁+m₂)*a (we choose as positive the direction of the acceleration, will be the one defined by the larger mass, in this case m₂)

⇒ a = (\frac{(m₂-m₁)}({m₁+m₂} * g = g/5 m/s²

Once we got the value of a, we can use for instance this kinematic equation, and solve for t:

Δx = 1/2*a*t² ⇒ t² = (2* 1.96m *5)/g = 2 sec² ⇒ t = √2 = 1.41 sec.

You might be interested in
A planet exerts a gravitational force of magnitude 4e22 N on a star. If the planet were 3 times closer to the star (that is, if
Alex_Xolod [135]

Answer:

3.6\times10^{23} N

Explanation:

F=\frac{GmM}{r^2}=4\times10^{22} N

F'=\frac{GmM}{(r/3)^2}=9\frac{GmM}{r^2}=9\times4\times10^{22}=3.6\times10^{23} N

7 0
2 years ago
Under what circumstances can energy level transitions occur?
Yuliya22 [10]

Answer:

Energy transition therefore occurs due to the amount of kinetic energy gained by the electrons. The electrons with higher kinetic energy are excited to the higher level (excited state) compare to the electron with low kinetic energy (this energy are energy in the ground state)

Explanation:

Energy level transition occur when light rays strikes a metal surface to emit electron from the surface, a term known as photoelectric effect. This amount of electron emitted from the surface depends on the speed of light ray striking the metal surface.

Energy transition therefore occurs due to the amount of kinetic energy gained by the electrons. The electrons with higher kinetic energy are excited to the higher level (excited state) compare to the electron with low kinetic energy (this energy are energy in the ground state)

8 0
3 years ago
The correct answer is 40 or - 40??
arsen [322]

Answer:

40

Explanation:

6 0
3 years ago
If a man does 4500 J of work from a high rise building of 10 m, what is his mass?
GalinKa [24]

Explanation:

The potential energy (Ep) = 4500 J

Ep = m. g. h

=> m = Ep/(g.h)

m = 4500/(10×10)

= 4500/100

= 45

so, the mass = 45 kgs

4 0
3 years ago
Read 2 more answers
Chadwick received the Doctor of? 1.Human Letters
cupoosta [38]
I think it’s maybe 2. But I’m not sure
7 0
3 years ago
Other questions:
  • A glass lying on table doesn't possess friction.why?
    13·1 answer
  • What are three major types of fungi and an example of each.​
    15·2 answers
  • An oil film with refractive index 1.48 and thickness 290 nm is floating on water and illuminated with white light at normal inci
    8·1 answer
  • A 26.4 kg beam is attached to a wall with a hinge and its far end is supported by a cable. The angle between the beam and the ca
    7·1 answer
  • An automobile engine has an efficiency of 19.0%. If it produces 23.0 kJ of mechanical work per second, the heat rejected per sec
    5·1 answer
  • a desktop computer and monitor together draw about 2 A of current they plug into a wall outlet that is 120 V what is the Resista
    11·1 answer
  • You are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of 275 N in the positive x di
    12·1 answer
  • How did potential energy get stored in the spring/pom pom system?
    9·1 answer
  • Calculate the volume of material whose density is 0.798gcm-3 and a mass 25g
    9·2 answers
  • What is the deceleration of the rocket sled if it comes to rest in 1.1 s from a speed of 1000 km/h? (such deceleration caused on
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!