A balloon floats inside a stopped car. When the car starts moving forward, the balloon appears to move backward relative to the car. Which statement best explains this observation?(1 point)
Responses
The force of inertia on the balloon balances the force from the motion of the car.
The force of inertia on the balloon balances the force from the motion of the car.
The motion of the car creates an unbalanced backward force on the balloon.
The motion of the car creates an unbalanced backward force on the balloon.
Inertia prevents the force of the car from acting on the balloon.
Inertia prevents the force of the car from acting on the balloon.
The car moves forward, while inertia keeps the balloon in place.
Inertia prevents the force of the car from acting on the balloon.
Four movers pick up boxes. Each box has a different mass, and each mover applies a different amount of force to lift the box. Which box will have the greatest acceleration?(1 point)
Responses
a 10 kg box lifted with 40 N of force
a 10 kg box lifted with 40 N of force
a 20 kg box lifted with 60 N of force
a 20 kg box lifted with 60 N of force
a 10 kg box lifted with 60 N of force
a 10 kg box lifted with 60 N of force
a 20 kg box lifted with 40 N of force
a 20 kg box lifted with 60 N of force
A baseball has a mass of 145 g. A pitcher throws the baseball so that it accelerates at a rate of 80 m/s2. How much force did the pitcher apply to the baseball?(1 point)
Responses
1.8 N
1.8 N
0.6 N
0.6 N
65 N
65 N
11.6 N
11.6 N
Can you break it down for me please?
Sure! To find the force applied to the baseball, we can use Newton's second law of motion, which states that force (F) equals mass (m) multiplied by acceleration (a).
Given:
Mass of the baseball (m) = 145 g = 0.145 kg
Acceleration (a) = 80 m/s²
Using the formula:
F = m * a
Substituting the given values:
F = 0.145 kg * 80 m/s²
Multiplying, we get:
F = 11.6 N
Therefore, the force applied to the baseball is 11.6 Newtons.
Newton's Third Law Quick Check
2 of 52 of 5 Items
Question
According to Newton’s third law of motion, which statement is always correct?(1 point)
Responses
If two moving objects collide, then they will bounce off each other.
If two moving objects collide, then they will bounce off each other.
If two moving objects collide, then both will stop moving.
If two moving objects collide, then both will stop moving.
If a moving object hits another object, then the second object will push back.
If a moving object hits another object, then the second object will push back.
If a moving object hits another object, then the second object will start moving.
If a moving object hits another object, then the second object will push back.
Which of the following is an equivalent expression to 7cubed/ 25 to the power of −4
with only positive exponents, generated by applying the Property of Negative Integer Exponents?
To convert the given expression to an equivalent expression with only positive exponents, we can apply the property of negative integer exponents, which states that a negative exponent can be converted to a positive exponent by moving the term to the denominator (or numerator, depending on its original position).
In this case, we have 7 cubed (7³) in the numerator and 25 to the power of -4 (25⁻⁴) in the denominator.
Applying the property of negative exponents, we can move 25⁻⁴ to the numerator as 1/25⁴ (since a negative exponent represents the reciprocal of the base raised to the positive exponent).
Therefore, an equivalent expression with only positive exponents would be 7³/25⁴.
Which sentence includes a gerund?(1 point)
Responses
My family is impressed by my cooking.
My family is impressed by my cooking.
I am running a marathon this weekend.
I am running a marathon this weekend.
The runners are lacing up their shoes.
The runners are lacing up their shoes.
A healthy breakfast of steaming hot biscuits is served.