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mafiozo [28]
3 years ago
8

Starting at (0,0) an object travels 36 meters north and then it covers 20 meters east. What is

Physics
1 answer:
Svetradugi [14.3K]3 years ago
8 0

Answer:

Explanation:

Using the pythagoras theorem, the displacement is expressed as;

d² = x²+y²

y = 36m (north)

x = 20m east

Substitute;

d² = 36²+20²

d² = 1296+400

d² = 1696

d = √1696

d = 41.18m

For the direction;

theta = tan^-1(y/x)

theta = tan^-1(36/20)

theta = tan^-1(1.8)

theta = 60.95°

Hence the magnitude is 41.18m and the direction is 60.95°

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A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.0 m/s at ground level.
BARSIC [14]

Answer:

There is an interval of 24.28s in which the rocket is above the ground.

Explanation:

y_{i}=0m

v_i=80\frac{m}{s}

a=4\frac{m}{s^2}

y_{e}=1000m

g=9.8\frac{m}{s^2}

From Kinematics, the position y as a function of time when the engine still works will be:

y(t)=v_it+\frac{1}{2}at^2

At what time the altitud will be y_{e}=1000m?

v_it+\frac{1}{2}at^2=y_{e} ⇒ \frac{1}{2}at^2+v_it-y_{e}=0

Using the quadratic formula: t_1=10s.

How much time does it take for the rocket to touch the ground? No the function of position is:

y(t)=y_{e}+v_et-\frac{1}{2}gt^2

Where our new initial position is y_{max}, the velocity when the engine breaks is v_e=v_i+at=120\frac{m}{s} and the only acceleration comes from gravity (which points down).

Now, when the rocket tounches the ground:

y_{e}+v_et-\frac{1}{2}gt^2=0

Again, using the quadratic ecuation:

t_2=24.49s

Now, the total time from the moment it takes off and the moment it tounches the ground will be:

t_T=t_1+t_2=34.49s.

6 0
3 years ago
In 2 minutes, a ski lift raises four skiers at a constant speed to a height of 123 m. The average mass of each skier is 71 kg. W
serious [3.7K]

Answer:

The average power  provided by the tension in the cable pulling the lift is = 714 W

Explanation:

Given data

Mass = 71 kg

Change in height = 123 m

When the lift moves in upward direction then in that case kinetic energy is constant & only potential energy changes.

Change in potential energy Δ PE = m g ( h_f - h _ i )

Δ PE = 71 × 9.81 × 123

Δ PE = 85670.73 J

Time = 2 min = 120 sec

So average power is given by

P_{avg} = \frac{Change \ in \ potential \ energy}{Time}

P_{avg} = \frac{85670.73}{120}

P_{avg} = 714 \ W

Therefore the average power  provided by the tension in the cable pulling the lift is = 714 W

7 0
3 years ago
List the two key components of kinetic energy
fomenos

Answer:

no energy is lost or gained when molecules collide

molecules are constant, linear motion

Explanation:

6 0
3 years ago
A slab of thermal insulator is 200cm square in cross section and 5cm thick.If thermal conductivity is0.50 and temperature differ
AleksandrR [38]

Answer: 5184 kJ

Explanation:

Given

Area of cross-section A=200\ cm^2

thickness of slab t=5\ cm

thermal conductivity k=0.5\ W/m-K

temperature difference \Delta T=150\ K

Heat flow is given by

\Rightarrow Q=kA\dfrac{dT}{dx}\\\Rightarrow Q=0.5\times 200\times \dfrac{150}{5}\times 10^{-2}\\\Rightarrow Q=30\ W\ or\ 30\ J/s

for 2 days time period, it is

t=2\ days\ or\ 2\times 24\times 60\times 60\ s\\t=1,72,800\ s

Heat flow in 2 days

Q=30\times 172800=5184000=5184\ kJ

3 0
2 years ago
What Is the meaning of density
Semmy [17]
<span>the degree of compactness of a substance.</span>
5 0
3 years ago
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