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Novosadov [1.4K]

3 years ago

13

You launch a ball at an angle of 35 degrees above the horizontal with an initial velocity of 38 m/s. What is the time the ball w

ill stay in the air? [Must show work]

1 answer:

gayaneshka [121]3 years ago

5 0

Vf=Vi+at

0=38+(-9.8)(?)

?=38-0+(-9.8)

?=28.2 s

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5 examples of neutons 3rd law of motion

Lemur [1.5K]

Examples of Newton's third law of motion are ubiquitous in everyday life. For example, when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air. Engineers apply Newton's third law when designing rockets and other projectile devices.

3 0

3 years ago

Read 2 more answers

You are driving to the grocery store at 18 m/sm/s. You are 160 mm from an intersection when the traffic light turns red. Assume

inysia [295]

Answer:

part(a) 151 m

part(b) 1.073 m/s2

part(c) 16.7 secs

Explanation:Firstly the person applied brakes 0.5 secs after seeing the red light hence the distance traveled during this time is

d=v*t

d=18*0.5

d=9m

For part (a)

I have corrected this question and now

The person was 160m from the intersection before applying the brakes as he traveled 9m before the brakes

He is now 151 m from intersection as

s=160-9

s= 151 m

part (b)

As it is given that velocity of the car is 0 at the intersection so we use this information in kinematic equation

$v^2=u^2+2as$

here u=18m/s and s=151

$0=18^2+2a*151\\302a=-324\\a=-1.073 m/s^2$

To calculate time we can use the acceleration equation

$a=\frac{v-u}{t} \\t=\frac{v-u}{a}\\t=18/1.073\\t=16.77 secs$

6 0

3 years ago

A blacksmith heats a 1,540 g iron horseshoe to a temperature of 1445°c before dropping it into 4,280 g of water at 23.1°c. if th

Marta_Voda [28]

Given:
m₁ = 1540 g, mass of iron horseshoe
T₁ = 1445 °C, initial temperature of horseshoe
c₁ = 0.4494 J/(g-°C), specific heat

m₂ = 4280 g, mass of water
T₂ = 23.1 C, initial temperature of water
c₂ = 4.18 J/(g-°C), specific heat of water
L = 947,000 J heat absorbed by the water.

Let the final temperature be T °C.
For energy balance,
m₁c₁(T₁ - T) = m₂c₂(T - T₂) + L
(1540 g)*(0.4494 J/(g-C))*(1445-T C) = (4280 g)*(4.18 J/(g-C))*(T-23.1 C) + 947000 J
692.076(1445 - T) = 17890(T - 23.1) + 947000
10⁶ - 692.076T = 17890T - 413259 + 947000
466259 = 18582.076T
T = 25.09 °C

Answer: 25.1 °C

3 0

3 years ago

An archer puts a 0.285 kg arrow in a bow and uses an average force of 182 N to draw the string back 1.32 m. Assume the energy st

vagabundo [1.1K]

Answer:

speed of the arrow as it leaves is 41.05 m/sec

Explanation:

We have given mass m = 0.285 kg

Average force F = 182 N

Distance traveled d = 1.32 m

We know that work done = force $\times$ distance

Sp work done = $182\times 1.32=240.24J$

Now according to work energy theorem work done will be equal to kinetic energy

So $\frac{1}{2}mv^2=240.24$

$\frac{1}{2}\times 0.285\times v^2=240.24$

$v^2=1685.89$

v = 41.05 m/sec

So speed of the arrow as it leaves is 41.05 m/sec

4 0

2 years ago

When lithosphere is subducted at a convergent plate boundary, the rock in the lithosphere heats up and the water that was locked

serg [7]

Answer:

In a convergent plate boundary, when the heavier lithospheric plate subducts below the less denser one, it eventually gets heated up when reaches into the deeper zone. Due to this high heating of the plate, the water present in the minerals and rocks of the subducting plate is released and it gradually mixes up with the hot molten rocks.

This eventually leads to partial melting of hot rocks, altering its actual composition, and also causes volcanism when the less denser magma rises upward towards the surface. In addition to this, it can also causes changes in the geothermal gradient in that particular place.

3 0

3 years ago