PHYSICS HIGH SCHOOL

A170 g hockey puck sliding at 25 m/s slows to a speed of 10 m/s in a distance of
7.5 m.  Determine the force of friction
causing the puck to slow.  

Answers

Answer 1
Answer: From 2nd Newton Law:
F=ma
m=170g=0,17kg
Acceleration using kinematic equations:
vk²=vp²+2aΔd
vp-initial velocity=25m/s
vk-ending velocity=10m/s
Δd-distance
a=( vk^(2)- vp^(2) )/(2Δd)
a=(100-625)/(2*7,5)
a=(-525)/(15)
a=-35(m)/(s)²
F=0,17kg*(-35m/s²)=-5,95N

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Please help me! In a collision, Kara Less who was traveling at 11 m/s while texting in her 1300 kg car, is struck by another vehicle and finds herself and her phone suddenly moving 2.5 m/s in the opposite direction. What impulse does she experience? SHOW WORKAnswer Choices

A. -12,000
B. -14,000
C. -16,000
D. -18,000

Answers

Answer:

D. -18,000

Explanation:

Let's define impulse :

  • Impulse is defined as the product of Force ( N ) applied on the body and the time of impact ( s ) or
  • The change in momentum

hence in this question ,

kara is initially moving with the :

  • velocity v_(i) = 11 ms^(-1)
  • finally moving with velocity v_(f) = -2.5 ms^(-1)    (minus as she moves in the opposite direction )

therefore the initial momentum p_(i) = m*v_(i)  = 1300*11 = 14300 kgms^(-1)

and the final momentum p_(f) = m*v_(f) = 1300*-2.5= 3250 kgms^(-1)

thus the change in momentum : p_(f) - p_(i)

= -3250-14300 = -17550 kgms^(-1) ≅ -18000kgms^(-1)

Why can't alpha particles penetrate deeply into solids? Alpha particles have low mass. Alpha particles have high mass. Alpha particles have low velocity. Alpha particles have high velocity.

Answers

Alpha particles have both high mass and low velocity, but it would be the former that determines why they can't penetrate. An alpha particle is made of two protons and two neutrons, which is quite a large mass for a particle. This large mass keeps it from penetrating too deeply into anything, since it will essentially "get stuck" when it comes too near to another atom.
So the answer, I believe, is B. Alpha particles have high mass.

The answer is the Alpha Particles have low velocity

A speeding car collides with an unlucky bug flying across the road Which explains why the impact doesn't equally damage the car and the bug

A. The car has more momentum
B.the bug is traveling faster
C. The bug has more momentum
D. The net force is zero

Answers

The collision produces forces between the car and the bug. These forces depend on the momentums of the objects that collide.Momentum is the product of mass and velocity. The greater the mass the smaller the acceleration. That is the Newton's second law. Because the mass of the car is greater, it's momentum is also greater and the accelaration is smaller. so, the bigger momentum of the car explains the different damage.

its A cat has more momentum

13. Sound waves can't travel through A. a solid.
B. a liquid.
C. an elastic material.
D. a vacuum.

Answers

They cannot travel through D a vacuum. They need a solid, liquid or gas to travel
D. a vacuum is the correct answer.

Because there are no particles in vacuum to transfer sound waves.

Using the value of atmospheric pressure at sea level, 1 × 105 Pa, estimate the total mass of the earth's atmosphere above a 5-m2 area.

Answers

Answer:

5×10^4 kg

Explanation:

pressure= force/Area

area= 5m^2

pressure = 1×10^5 Pa

1×10^5=mg/5 (weight will be the force)

5×10^5=m×10 (gravitational field strength of the earth)

5×10^5×10^-1 =m

mass=5×10^4 kg!

hope this helps!

Determined by the distance between objects and the difference in mass between the objects

Answers

Determined by the distance between objects and the difference in mass between the objects is gravity or gravitational force. Gravity is dependent on those two factors, and is what causes objects on Earth to stay on the ground. It is defined as the "pull" that an object with mass exerts on another object that makes the latter gravitate towards the former. Weight is the measure of gravitational force exerted by a mass.

Answer is gravitational force, according to e2020. Just took the review
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