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3 years ago

Someone help me please

Physics

2 answers:

riadik2000 [5.3K]3 years ago

6 0

the answer is 25 newtons

aleksley [76]3 years ago

5 0

Each time the distance doubles the gravity quarters, then at two earth radii it will weigh 25 Newton’s

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A rescue airplane is diving at an angle of 37º below the horizontal with a speed of 250 m/s. It releases a survival package when

alisha [4.7K]

Answer:

The correct option is 1. 720 m

Explanation:

Projectile Motion

When an object is launched in free air (no friction) with an initial speed vo at an angle $\theta$ , it describes a curve which has two components: one in the horizontal direction and the other in the vertical direction. The data provided gives us the initial conditions of the survival package's launch.

$\displaystyle V_o=250\ m/s$

$\displaystyle \theta =-37^o$

The initial velocity has these components in the x and y coordinates respectively:

$\displaystyle V_{ox}=250\ cos(-37^o)=199.7\ m/s$

$\displaystyle V_{oy}=250\ sin(-37^o)=-150.5\ m/s$

And we know the plane has an altitude of 600 m, so the package will reach ground level when:

$\displaystyle y=-600\ m$

The vertical distance traveled is given by:

$\displaystyle y=V_{oy}\ t-\frac{g\ t^2}{2}=-600$

We'll set up an equation to find the time when the package lands

$\displaystyle -150.5t-4.9\ t^2=-600$

$\displaystyle -4.9\ t^2-150.5\ t+600=0$

Solving for t, we find only one positive solution:

$\displaystyle t=3.6\ sec$

The horizontal distance is:

$\displaystyle x=V_{ox}.t=199.7\times3.6=720\ m$

The correct option is 1. 720 m

6 0

3 years ago

If a body is moving with constant linear positive acceleration

Jobisdone [24]

Answer:

Explanation:

It says constant positive linear acceleration, which means that the velocity increases at a constant rate.

7 0

2 years ago

Why doesnt food have energy

Nataly_w [17]

Food has calories which feeds your bones in your body from eating away your muscles, it doesn’t have “energy” on the other hand pop and drinks do.

3 0

4 years ago

Read 2 more answers

An electric heater supplies 5kw of power to atank of water assume all the energy supplied is converted into heat energy and the

kicyunya [14]

Answer:

8hours 45minutes

Explanation:

Amount of heat energy used up by the electric substance = heat gained by the water.

Amount of heat energy used up by the electric substance = Power * Time

heat gained by the water. = mcΔt

m is the mass of the water in kg

c is the specific heat capacity

Δt is the change in temperature

Given parameters

Power = 5kW = 5000W

mass of water m = 500kg

c = 4200J/kgC

Δt = 100°C - 25°C = 75°C

Required

Time taken

Substituting the given parameters into the formula

Pt = mcΔt

5000t = 500*4200*75

5000t = 157,500,000

Divide both sides by 5000

t = 157,500,000/5000

t = 31,500 secs

t = (31,500/3600)hrs

t = 8.75hours

t = 8hours 45minutes

Hence it takes 8hours 45minutes to heat 500 kg of water in the tank from 25c to 100c

6 0

4 years ago

A cable passes over a pulley. Because the cable grips the pulley and the pulley has nonzero mass, the tension in the cable is no

topjm [15]

Answer:

$\alpha=214.8 rad/s^2$

Explanation:

We are given that

$F_1=137 N$

$F_2=43 N$

Net force=F= $F_1-F_2=137-43=94 N$

Mass,m=1.21 kg

Radius,r=0.723 m

We have to find the magnitude of its angular acceleration.

Moment of inertia , $I=\frac{1}{2}mr^2$

Substitute the values

Torque , $\tau=I\alpha$

$F_{net}\times r=\frac{1}{2}mr^2\alpha$

$\alpha=\frac{2F_{net}}{mr}$

$\alpha=\frac{2\times 94}{1.21\times 0.723}$

$\alpha=214.8 rad/s^2$

4 0

3 years ago