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
KatRina [158]
3 years ago
5

A bullet with a mass ????=12.5 g and speed ????=86.4 m/s is fired into a wooden block with ????=113 g which is initially at rest

on a horizontal surface. The bullet is embedded into the block. The block-bullet combination slides across the surface for a distance ???? before stopping due to friction between the block and surface. The coefficients of friction are ????????=0.753 and ????????=0.659. (a) What is the speed (m/s) of the block-bullet combination immediately after the collision? (b) What is the distance d (m)?
Physics
1 answer:
skad [1K]3 years ago
4 0

Answer:

a) 8.61 m/s, b) 5.73 m

Explanation:

a) During the collision, momentum is conserved.

mv = (m + M) V

(12.5 g) (86.4 m/s) = (12.5 g + 113 g) V

V = 8.61 m/s

b) After the collision, energy is conserved.

Kinetic energy = Work done by friction

1/2 (m + M) V² = F d

1/2 (m + M) V² = N μk d

1/2 (m + M) V² = (m + M) g μk d

1/2 V² = g μk d

d = V² / (2g μk)

d = (8.61 m/s)² / (2 × 9.8 m/s² × 0.659)

d = 5.73 m

Notice we used the kinetic coefficient of friction.  That's the friction when an object is moving.  The static coefficient of friction is the friction on a stationary object.  Since the bullet/block combination is sliding across the surface, we use the kinetic coefficient.

You might be interested in
Which is capeble of housing astronaughts while they conduct reasearch
dusya [7]

Answer:

2

Explanation:

2

5 0
2 years ago
Read 2 more answers
Raj is trying to make a diagram to show what he has learned about nuclear fusion.
KIM [24]

No, he should place the He atom and energy on the right, and the H atoms and the heat and energy on the left.

6 0
3 years ago
Read 2 more answers
Which of the following iconic compounds forms an acid when dissolved in water
Anvisha [2.4K]

Answer: when an ionic compound dissolves in water, the positive ends of the water molecules are attracted to the anions and the negative ends are attracted to the cations.

Hydrogen Chloride (HCl) is a compound which forms an acidic solution when dissolved in water.

Hope it helps :)

Explanation:

6 0
3 years ago
Consider a golf club hitting a golf ball. To a good approximation, we can model this as a collision between the rapidly moving h
vekshin1

Answer:

1. 8.0kg * m/s

2. The same as before the collision

3. The force will decrease

4. 14 m/s

6 0
3 years ago
Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.5 cm-3, and their speed is 564 k
morpeh [17]

Answer:

A) 11.28 x 10^(7) A.m²

B) 2.258 x 10^(17)A

Explanation:

A) The current density is given by the formula ;

J = nqv

Where n is the density of protons in the solar wind which is 12.5 cm³ or 12.5 x 10^(-6) m³

q is the proton charge which is 1.6 x 10^(-19) C

v is velocity which is 564km or 564000m

Thus, J = 12.5 x 10^(-6) x 1.6 x 10^(-19) x 564000 = 11.28 x 10^(7) A.m²

B) the formula for the total current the earth received is given as;

I = JA

The effective area is the cross section of the earth and thus,

Area = πr² where r is the radius of the earth given as: 6.371 x 10^(6)

A = π(6.371 x 10^(6)) ²

So I = 11.28 x 10^(7) x π(6.371 x 10^(6))² = 2.258 x 10^(17)A

7 0
3 years ago
Other questions:
  • What element is produced when the isotope bismuth-213 emits a beta particle
    9·1 answer
  • How an elastic material can no longer be elastic but plastic instead?
    6·1 answer
  • What happens when the moon faces one side of the earth?
    12·1 answer
  • Given that the distance from the left end of the string to the first antinode is 27.5 cm , calculate the wavelength of the stand
    7·1 answer
  • How does the science of heat transfer differ from the science of thermodynamics?
    10·1 answer
  • A 1500 W electric heater is plugged into the outlet of a 120 V circuit that has a 20 A circuit breaker. You plug an electric hai
    13·1 answer
  • A 2.5kg object oscillates at the end of a vertically hanging light spring once every 0.65s .
    12·1 answer
  • The pedals on a bicycle give a mechanical advantage by allowing you to turn the pedals a __________ distance to turn the _______
    8·1 answer
  • A sample of iron receives 50.J of heat energy that raises the temperature of the iron
    14·1 answer
  • Distance meters Time (seconds) Trial Tria 2 Trials Average 3 053 059 0.52 055 6 106 719 104 Uning the values trom the data table
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!