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zhenek [66]
3 years ago
12

A projectile is fired in such a way that its horizontal range is equal to 8 times its maximum height. What is the angle of proje

ction? 7.13
Physics
1 answer:
ella [17]3 years ago
6 0

solution;

Projectile maximum height=\frac{vo/timessinthetha^{2}}{2g}\\Range =\frac{(vo)^2\times(2\times\theta )}{g}\\given,\\range=8.5\times maximum hight\\(vo)^2sin(2\times\theta )=\frac{8.5\times(vo\times sin\theta )^2}{g}\\sin(2\times\theta )=\frac{8.5\times(sin \theta )^2}{2}\\2\times sun(\theta )\times cos(\theta )=4.25\times(sin \theta )^2\\using,{sin(2\times\theta )=2\times sin(\theta)\cos\theta}\\2\timescos(theta)=4.25\times sin(theta)\\tan \theta =\frac{2}{4.25}\\tan \theta =0.47\\tan\theta=25.2

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A chunk of metal has a volume of
Alla [95]

Answer:

7213.7kg/m³

Explanation:

Given parameters:

Volume of the metal chunk  = 0.131m³

Mass of the metal chunk  = 945kg

Unknown:

Density of the metal chunk  = ?

Solution :

To solve this problem, density is the mass per unit volume. It is mathematically expressed as;

  Density  = \frac{mass}{volume}  

 So;

 Density  = \frac{945}{0.131}   = 7213.7kg/m³

5 0
3 years ago
A water wave most resembles what ? <br> O light wave<br> O transverse wave<br> O longitudinal wave
Flauer [41]

Answer:

i am not a point taker i help people when they need help

Explanation:

3

i think it is right

5 0
3 years ago
You are running at a speed of 10km/h and hit a patch of mud. Two seconds later you speed is 8km/h. What is your acceleration in
Vlad1618 [11]

Answer:

0.28 m/s^2

Explanation:

Acceleration is given by

a=\frac{v-u}{t}

where

u is the initial velocity

v is the final velocity

t is the time interval

In this problem:

u = 10 km/h \cdot \frac{1000 m/km}{3600 s/h}=2.78 m/s is the initial velocity

v = 8 km/h \cdot \frac{1000 m/km}{3600 s/h}= 2.22 m/s is the final velocity

t = 2 s is the time

Substituting, we find the acceleration:

a=\frac{2.78-2.22}{2}=0.28 m/s^2

5 0
4 years ago
The temperature of the cosmic background radiation is measured to be 2.7 k. What is the wavelength of the peak in the spectral d
KATRIN_1 [288]

Answer:

1.07\cdot 10^{-3} m

Explanation:

The peak wavelength of the spectral distribution can be found by using Wien's displacement law:

\lambda=\frac{b}{T}

where

b=2.898\cdot 10^{-3} m\cdot K is Wien's displacement constant

T is the absolute temperature

For the cosmic background radiation, the temperature is

T = 2.7 K

So, the corresponding peak wavelength is

\lambda=\frac{2.898\cdot 10^{-3} m\cdot K}{2.7 K}=1.07\cdot 10^{-3} m

7 0
3 years ago
A parallel circuit has three branches. Each branch has a resistance of 37.5 ohms. The total current is 7.5 amps. What is the cur
Sophie [7]

Answer:

Current in each branch will be 2.5 A

Explanation:

We have given that a circuit has three branch each has a resistance of 37.5 ohm

We have also given that a total current of 7.5 A is flows through the circuit

As we know that in parallel circuit total current is the sum of current flowing through each branch

As the resistances of each branch is same so current will also be same

As there is 3 branches in circuit so current in each branch will be \frac{7.5}{3}=2.5A

4 0
4 years ago
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