Identify some common fuels

Answers

Answer 1

Answer: On a worldwide scale, the most common fuels are wood, grass, peat, coal, and animal fats and oils.

Answer 2

Answer: Coal, Wood, Petroleum, Natural Gas, Kerosene, Diesel, LPG (Liquefied Petroleum Gas), CNG (Compressed Natural Gas), Coke etc. are some commonly used fuels.

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A skier has an acceleration of 2.5 m/s2. How long does it take her to come to a complete stop from a speed of 18 m/s?

Answers

(Assuming acceleration is -2.5m/s2) 7.2 seconds.

a = 2.5 m/s²

since , we have to stop so v = 0 m/s ( final velocity)

u = 18 m/s

t = ?

using ,

⇒ v = u + at

⇒ 0 = 18 + 2.5t

by this we are getting t<0 , since , t cant be -ve , Check your question

Two 0.006 Kg bullets are fired with speeds of 20.0 m/s and 50.0 m/s respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the difference of their kinetic energies?

Answers

Answer:

a) Kinetic energies

K₁ = 1.2 J

K₂ = 7.5 J

b) The bullet that has the highest kinetic energy is the one with the highest speed , v = 50 m/s , K₂ = 7.5 J

c) K₂ -K₁ = 6.3 J

Explanation:

The kinetic energy (K) is that due to the movement of a body and is calculated as follows:

K = (1/2) m*v² (J)

Where :

m : the mass of the body ( kg)

v is the speed of the body (m/s)

Data

m₁ = m₂ = 0.006 Kg

v₁ = 20 m/s

v₂ = 50 m/s

a)Calculation of the kinetic energy

K₁ = (1/2) (m₁)*(v₁)²

K₁ = (1/2) (0.006)*(20)²

K₁ = 1.2 J

K₂= (1/2) (m₂)*(v₂)²

K₂ = (1/2) (0.006)*(50)²

K₂ = 7.5 J

b) K₂ ˃ K₁

The bullet that has the highest kinetic energy is the one with the highest speed , v = 50 m/s, K₂ = 7.5 J

c) Difference of their kinetic energies (K₂ -K₁)

K₂ -K₁ = 7.5 J - 1.2 J = 6,3 J

The psychologist who worked with Peter and helped him associate rabbits with positive things was: a. Mary Covert-Jones
b. Ivan Pavlov
c. Elizabeth Loftus
d. John Watson

Knowing the formula for water and table salt is an example of:_________________memory.
a. episodic
b. procedural
c. semantic
d. echoic

The part of the brain that appears to be involved in the processing of short-term memories into long term is the:
a. hypothalamus
b. hippocampus
c. corpus callosum
d. cerebrum

Answers

1. Mary Cover-Jones

2.Knowing the formula for water and table salt is an example of episodic memory. so d

3.Hippocampus

Answer:

1) Mary Cover-Jones

2) episodic

3) hippocampus

Hope this helped man!

A jet plane lands at a speed of 100 m/s and can accelerate at a maximum rate of -5.00 m/s^2 as it comes to a rest.(a from the instant the plane touches the runaway, what is the minimum time needed before it can come to a rest?
(b Can this plane land on a runaway that is only 0.800 km long?
shown work pls will reward alot of points

Answers

Answer:

a) t = 20 s, b) x = 1000 m, As the runway is only 800 m long, the plane cannot land at this distance

Explanation:

This is a kinematics exercise

a) in minimum time to stop,

v = vo + at

v = 0

t = -v0 / a

we calculate

t = -100 / (5.00)

t = 20 s

b) Let's find the length you need to stop

v² = vo² + 2 a x

x = -v0 ^ 2 / 2a

x = - 100² / 2 (-5.00)

x = 1000 m

As the runway is only 800 m long, the plane cannot land at this distance.

An arrow is shot vertically upward from the top edge of a 300 m cliff with a speed of 50 m/s, and it just misses the edge on the way down. What is its speed when it hits the base of the cliff? [91.5 m/s]