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
emmasim [6.3K]
3 years ago
10

In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.8 m/s. However, this speed is inade

quate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the distance between the players before sliding to a halt. What minimum initial speed should the puck have been given so that it reached the teammate, assuming that the same force of kinetic friction acted on the puck everywhere between the two players?
Physics
1 answer:
erastova [34]3 years ago
8 0

Answer:

3.95979 m/s

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

v^2-u^2=2as\\\Rightarrow as=\frac{v^2-u^2}{2}\\\Rightarrow as=\frac{0^2-2.8^2}{2}\\\Rightarrow as=-3.92

Here s=\frac{1}{2}s

\\\Rightarrow as=-7.84\ m/s^2

v^2-u^2=2as\\\Rightarrow -u^2=2as-v^2\\\Rightarrow u=\sqrt{v^2-2as}\\\Rightarrow u=\sqrt{0^2-2\times -7.84}\\\Rightarrow u=3.95979\ m/s

Initial velocity of the puck should be 3.95979 m/s

You might be interested in
An electron enters a region of space containing a uniform 0.0000193-T magnetic field. Its speed is 121 m/s and it enters perpend
Mandarinka [93]

Answer

Given,

Magnetic field, B = 0.0000193 T

speed, v = 121 m/s

mass of electron, m = 9.11 x 10⁻³¹ Kg

charge of electron, q = 1.6 x 10⁻¹⁹ C

radius of the electron path, r = ?

r = \dfrac{mv}{qB}

r = \dfrac{9.31\times 10^{-31}\times 121}{1.6\times 10^{-19}\times 0.0000193}

r = 3.64 x 10⁻⁵ m

We know frequency is inverse of time period

d = v t

2 \pi r = v \times t

t = \dfrac{2 \pi r}{v}

t = \dfrac{2 \pi \times 3.64\times 10^{-5}}{121}

t = 1.889 x 10⁻⁶ s.

now, frequency

f = \dfrac{1}{t}

f = \dfrac{1}{1.889\times 10^{-6}}

f = 529380\ Hz

3 0
3 years ago
Which statement correctly compares sound and light waves ​
kolbaska11 [484]

Answer:

Light waves carry energy parallel to the motion of the wave, while sound waves carry energy perpendicular to it. Sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.

Explanation:

8 0
3 years ago
What can be absorbed or released as the result of a chemical reaction?
Lera25 [3.4K]
Energy is released or absorbed ,but no loss in total molecules,each of which consists of one atom of oxygen and two of hydrogen,are broken down.!
3 0
3 years ago
Read 2 more answers
In which situation does heating a substance generally change the temperature?
marta [7]
The correct answer is C
5 0
3 years ago
N discussing engines, the ratio of output work to input work expressed as a percentage is called
djyliett [7]

The ration of output work to input work expressed as a percentage is called <u>Efficiency</u>.

5 0
3 years ago
Other questions:
  • The combined electrical resistance R of two resistors R_1 and R_2, connected in parallel, is given by 1/R = 1/R_1 + 1/R_2 where
    9·1 answer
  • A coil of wire with a current is called a(n)
    6·1 answer
  • The position vector of a particle of mass 2 kg is given as a function of time by ~r = (5 m) ˆı + (5 m/s)t ˆ . Determine the mag
    10·1 answer
  • A puck of mass m 0.085 kg is going in a circle on a horizontal frictionless surface. It is held in its orbit by massless string
    11·1 answer
  • I need help with this physics question
    10·1 answer
  • An 0.08 kg arrow is shot from a bow with a velocity of 25 m/s.
    6·1 answer
  • Which equation will tell you the acceleration of the object?
    10·1 answer
  • Please help me with the following question:
    14·1 answer
  • What are conspiracy theories?​
    13·1 answer
  • 4. A 20-kg box sits on an incline of 30° from the horizontal. The coefficient of friction between the box and the incline is o.3
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!