2 years ago

If humans cannot see ultraviolet waves how can ultraviolet light be used to gather evidence of a crime

2 answers:

8 0

Ultraviolet light is invisible but it gets absorbed by body fluids like blood or semen and can be re-emitted as visible light. In a darkened crime scene, body fluids will show up and can be collected and analysed.

Liono4ka [1.6K]2 years ago

3 0

Answer:

Ultra violet detects the presence of radioactive substances. Ultra violet light causes substances to fluoresce and give off visible light.

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A car accelerates uniformly from rest at a speed of 1.67 ft s^2 over a distance of 5 yards.What is the acceleration of a car?

Nina [5.8K]

Answer:

a= 17.69 m/s^2

Explanation:

Step one:

given data

A car accelerates uniformly from rest to 23 m/s

u= 0m/s

v= 23m/s

distance= 30m

Step two:

We know that

acceleration= velocity/time

also,

velocity= distance/time

23= 30/t

t= 30/23

t= 1.30 seconds

hence

acceleration= 23/1.30

accelaration= 17.69 m/s^2

5 0

2 years ago

Read 2 more answers

Plz i need help please help

Gemiola [76]

Answer:

if you look it up i think u can find it it could be a mealltiod Co 27

Explanation:

3 0

2 years ago

4. How long would it take for a water balloon to fall 39 m if we dropped it starting from rest down an

Paraphin [41]

Answer:

Around 2.8212 sec

Explanation:

Given the eqn x=1/2at^2+vot

your vo=0

39=1/2(-9.8)t^2

=7.95=t^2

=2.82sec

8 0

2 years ago

a pulley of diameter 15.0 cm is driven by a motor that revolves at 10 rpm. the pulley drives a 2nd pulley with diameter 10.0 cm.

suter [353]

6.67prm

diam1/diam2 = rpm1/rpm2

3 0

2 years ago

What is the kinetic energy of a 7.26 kg bowling ball that is rolling at a speed of 2m/s

vlada-n [284]

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

$k = \frac{1}{2} m {v}^{2} \\$

m is the mass

v is the velocity

From the question we have

$k = \frac{1}{2} \times 7.26 \times {2}^{2} \\ = 2 \times 7.26$

We have the final answer as

Hope this helps you

4 0

2 years ago