Jesse travels 3.0 meters east and then turns and travels 4.0 meters north. what distance did jesse travel? 1 m 5 m, northeast 7 m 7 m, northeast

Answer : The correct option is, 7 m

Explanation :

Distance : It is defined as the how much distance is covered by an object during the motion. It is a scalar quantity that means it does not depends on the direction.

Displacement : It is defined as the change in the position of an object. It is a vector quantity that means it has magnitude and as well as direction.

According to the question,

The distance traveled by jesse towards east = 3.0 m

The distance traveled by jesse towards north = 4.0 m

The total distance traveled by jesse = 3.0 m + 4.0 m = 7.0 m

Hence, the distance traveled by jesse is, 7 m

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

since electrons are negative the answer is neagtaive