What is one measurement needed to calculate the speed of an object? direction, mass, time, or velocity? ?

Option C = Time

Explanation:

Speed:

''It is the distance travel in per unit time". It tells the capacity of moving object how fast it is moving. It is scalar quantity and can be explain just in term of magnitude. It does not require direction. For example we can say that someone is moving fast or moving slow. We are telling the magnitude of speed either its high or slow. If the object is not moving then its speed will be zero.

Formula:

r = d / t

r = speed   (it can also be represented by v)

t = time taken to cover the distance

d =  distance

Unit:

The system international unit of speed is m/s. It can also be given in Km/h

Example:

A car cover the 300 Km distance in a four hour. what is the speed of car?

Given data:

Distance = 300 km

Time = 4 hr

speed = ?

v = d / t

v = 300 km / 4 hr

v = 75 km/ hr

The speed of car is 75 km/hr.

1.consider the following balanced equation and answer parts a through. show calculations for each part.  

3 ag(s) + 4 hno3(aq) → 3 agno3(aq) + no(g) + 2 h2o(l)  

a. calculate the number of moles of agno3 produced by the reaction of 3 moles of ag with excess hno3. if the number to the left of the compound represents the number of moles of the compound which are present, then 3 moles of ag react with 4 moles hno3 to produce 3 moles agno3 (aq).

so the answer to a would be 3 moles.

b. calculate the number of moles of agno3 produced by the reaction of 108 grams of ag with excess hno3.  

i'm not sure how to plug in the grams of silver into an equation using moles to find how many moles are produced.

c. calculate the number of grams of agno3 produced by the reaction of 108 grams of ag with excess hno3  

d. calculate the number of moles of no produced as a byproduct of the reaction of 108 grams of ag with excess hno3.  

e. calculate the number of grams of no produced as a byproduct starting with 108 grams of ag and excess hno3.  

explanation: